Talk:Thresh/@comment-24704296-20140906214333/@comment-5266525-20140922121240

A better way to put it is that mobility is the only niche he excels in that no other support (or even champion) does. I don't mean that he is mobile but that he gives mobility to allies.

He doesn't really excel at anything else except maybe for CC (he's a worse bodyguard than Alistar and Janna and worse at lockdown than Leona but he's good at both), so if mobility were to ever become unnecessary to to the game he would consequently not have much reason to be picked.