TP system is broken and ppl are abusing it, that is what happens when devs implement BS instead of think about something so obvious for like, two minutes.
Being TELEPORTED is a luxury and we need to pay for this. This is what limit the in-game ganks and some stupid actions like bring a lvl80 char to abandoned camp in five seconds just to kill some annoying noob kid.
But... but... there is like that! Buffers are support classes! It doesn't mean that you cant kill alone..... it just less easy.
Well if you dont play together in a MASSIVE MULTIPLAYER ONLINE RPG then.... play only an RPG