There does seem to be a lot of miscommunication based on telescience within the topic, much like Jazz said. I think trying to break each and every complaint / pros for telescience will show that it's not as "Robust" and "Broken" as people claim it to be.
Telescience is nearly broken by itself from the start, unless you're a super computer that knows everything wrong / right and how to do telescience immediately, you'll never successfully do it without a program. But a program itself doesn't even help you to begin with, the programs that you are talking about only help you with coordinates that you ALREADY have.. and even then, nearly every program (Such as one that I've used myself) you need to calibrate both the program and the telescience in-game to even make it successful. Fun fact: You know that calibrate in telescience for the crystals? There's a chance that after every teleport, that the calibration turns wrong, especially if you re-calibrate the crystals, as it will change the whole of telescience, meaning you have to redo from the start. "Sadly, teleportations (the exact number is randomized every calibration) the Telepad will decalibrate. This means that the telepad simply will not work, and when you hit recalibrate again, you will have to recalibrate your offsets."
In a way, it certainly can help traitors but this is ENTIRELY subjective. You can say that a traitor can use telescience for anything.. stealing an item / object, stealing a locker, stealing <insert whatever here>, teleporting a person or even teleporting a bomb onto someone to blow them up. But EVERYTHING is subjective in this way. Let's just magically say that you know the coordinates for where an item you have to steal is.. what's to say the item is still there? What's to say someone hasn't already taken it or walking around with it? What's to even say you got the right coordinates? How are you going to take it off the person constantly walking around, with their coordinates changing every second? Another fun fact: Unless that person has sensors onto full, they'll NEVER have full coordinates to figure out where you even are. And even if you did manage to get lucky and say teleport a bomb onto someone / somewhere and it goes off, if that person survives / is SR'd / cloned, they'll scream of a magical teleporting bomb, and who does that point the finger to? Whoever is in science, meaning a full crackdown on science and telescience being deconstructed. And there is a delay on teleporting, both in receive and send.. of at least 3-5 seconds, enough time for anything to go wrong or happen.
As Jazz pointed out, this can easily be fixed by marking an area with the teleportation block flag, which most important areas in the game usually do have. Plus what exactly are you going to do? You're a traitor or just someone mucking about, and you teleport yourself to any of theses locations (And their respected outcomes):
Syndie Outpost: You teleport over, 1) You die to a syndie NPC. 2) You get shot to death by a turret. 3) You just realized you stranded yourself on a place with no communication, no space suit, and didn't tell anyone you were doing this because you wanted the selfish loot to yourself. 4) You have someone to help you back, but mucked up by moving and forgot which tile exactly pulls you back, as there's no communication at all.
Armory: You teleport over, 1) You get robusted by Armsky and announce your presense to every officer in security, you get arrested. 2) You teleport guns to yourself.. infront of all your co-workers who then report you to security. 3) You do it stealthy like, until security notices their stuff is missing and comes to the conclusion.
Vault: You teleport over, 1) Realize your an idiot and got yourself stuck for the Ai to find and get arrested. 2) You bring the nuke to you, good job.. now how are you going to hide it from everyone?
AI Upload: You teleport over, 1) Immediately stunned by turrets and robusted by the heads on the bridge.
Everything is subjective in the location you choose and the preparations you make for it, and even if you are FULLY prepared, there's nothing to say you'll ever succeed or win. Especially if you're doing it alone. And as stated before, EVERY z level is designed to change. Maybe one round you have the white ship in z level 1 near the station.. maybe another round it's at z level 3 near the engi outpost. And some z level specific stuff don't spawn at all, it's all randomized, the locations too.
No, the same situations happen as described above. How are you going to save someone from a spider if they are constantly moving? And as far as I'm aware, you can't teleport cocoons, meaning whatever people the spiders have.. will be stuck there unless freed. And what exactly are you going to use telescience for against the spiders or xenos? Trying to teleport someone to you, one spider stands on the tile.. you have a new friend come to bite your face off.
It's really not.. do you know the materials and such needed for it?
1x Telepad Control Board
1x Telepad board
1x Console screen
11x Cable Coil
10x Metal Sheets
5x Bluespace Crystals
1x Quadratic Capacitor
So not only do you need the glass and materials to make the telepad boards, you also need Bluespace crystals.. which is rare on mining to find, requiring a full 5 meesh, xenobiology to be ontop of slimes or artifical bluespace crystals which even then costs diamonds and uranium. But also a Quadratic Capactior, which you can only get by Power level 6/7, which also requires xenobiology. And then there's the random off-shoots of when you even make it.
It just seems like there's a lot of miscommunication, and not taking into account various factors, while complaining about something because "It's OP". Robotists with materials in 30 minutes, can make Gygax's for all of security. Science with materials in 40-50 minutes, can make enough AEGs, X-ray implants and various other stuff for security to last them all shift. Chemisty + Science chem + Toxins can make enough bombs, explosives, grenades and the like (Especially Science Chem with reusable cases) in a flat 5 minutes to destroy, kill, or breach multiple areas on the station, especially with the latest update to chem dispensers. Medical, with sciences help, can have 4-6 cloning pod cloning people all at once. Genetists can randomly fire hulk and start smashing everything in sight. A traitor with the right know how can literally build themselves an AI upload.
And those situations are deliberate and happen every single round, yet, no one calls them "OP" for the sake of "They help" when they literally make certain people / crew / antag's life a living hell. Imagine you're an antag, got all the best loot, best gear, holopara, suit to survive in space while taunting and having ago at security about how you're getting away with things. Then all of a sudden one the officer has an x-ray laser gun, with x-ray vision / implant and manages to get you into crit within a few shots that you can barely react too. Telescience is constantly random, it's barely OP.