Or at least rarely do they. TK's like Jean or Rachel Grey should be amongst the most unstoppable charcters there are if they would just employ a few very simple tactics which you never or virtually never see them use.
1. They could use their power to stop an enemies heart briefly. Jean did this one time way back in X-Factor when she stopped Rictor's heart for a second to make him pass out. But never since to my knowledge. Its hard to use the old excuse of it might harm the person given that beating the crap out of them (the standard supehero tactic) is clearly harmful to the person.
2. Or another tactic that would work against any enemy that doesn't have a long distance attack. Lift them off the ground. Get em even two inches off the ground and they are done fighting til you drop them. Unless they still have a way to attack you (gun, energy blast, mind power, etc) they are at the TK's mercy. The TK can now spin them like a top to make them super dizzy when they put them down, drop them off a building, or just hold them there while the others on the TK's team pound on the guy with their own long distance attacks. Even with the enemies that have distance attacks if you catch em by surprise you could spin them so fast they would become disoriented and unable to fight back.
3. Use the TK to hold their eyes shut. Jean did this one time I recall (again in X-factor) to the Hulk. It worked well enough although she had a hard time holding it due to superstrength in his eyelids.
4. Use TK to stop the flow of blood in the carotid arteries for a second which would cause the person to pass out. Might not work against invulnerable characters but it would against the rest. And again less harmful than beating the snot out of someone. I think this was essentially what a low grade TK in Rising Stars did only she kept the pressure on and would kill people this way.
It took me a while to get sleep and when I'm in that state of not quite falling asleep I tend to think up lots of crazy things if you can't tell.