Why was Hexakill only played on SR once? Now its only on TT.

Hexakill on the rift is largely the same game as normal. I didn't play it, but logically you'd just want a second support to go top lane, at least optimally. Problem there is that we already have too few supports, so who's going to want to be the second one?? Maybe some teams try 2 junglers, or send three people mid or something, but overall it just isn't a big change.

On twisted treeline it's a lot more crowded and just degenerates in to chaotic teamfights. Which makes it a mode I bore of quickly (and I'd imagine most people do), but regardless it's at least a major difference. It also 'feels' a lot more special because most people don't play the treeline normally, so vilemaw and the alters are a big change for them.