Tahm Kench has the only one ability that makes him a support and is the most toxic part of his kit.
Devouring allies. He'd do just fine in mid/top/jungle without it. Instead he has a kalista-ult level ability as a non-ultimate ability, while being quite strong in every other field. The problem with devouring allies is that it saves Tahm's allies from the punishment otherwise unavoidable, caused by their gravest mistakes. We have Thresh's lantern, Kalista's ult that work similar, BUT:
- You have to click on lantern
- There is a huge cd on Kalista's ult Now look at the Devour cd plus you don't have to do anything to be saved by Tahm. I'm seriously baffled as to why Riot can't understand such a simple thing. Tahm should NOT be a support.