Why do people take TP in bot lane?
Lately I've played a few games where my bot lane partner has taken TP for some god forsaken reason only for it to come to absolutely no use. I've been told that bot laners are most efficient if they're in lane together at the same time (ie: recall together where practicable) taking TP only puts you at a disadvantage unless you both take it. I feel like every single time we've either done poorly lane in (forcing my partner to recall and use TP to get back in) which could have been avoided if they'd taken heal or exhaust or barrier or flash in the first place. And sometimes I feel like we could have taken kills had we had the utility of one of the above summoner spells (or heck, even ignite) but lose the chance because someone's got a useless teleport which at most nets them a couple of CS which a) they could have gotten anyway by just pushing the lane before backing or b) in the event that they weren't in a position to push the lane (other team is more dominant) they just get dived 2v1 as the enemy siege the turret. Complete waste of a slot. You could argue split pushing but supports can't really do that and 9/10 ADCs are better off staying with the rest of the team either fighting or holding while someone else splits because 9/10 times the enemy's just going to send an assassin to deal with them and again they just waste their time with teleport.
Of course if you're really good and can 1v2 without the need for any defensive spells go for it but if you're not confident you can do that stop taking TP in bot lane. Especially don't take TP in place of flash on Kog'maw jesus christ.