Why is one for all on summoners rift?

Not sure how many people would agree but I think this mode would be so much better if it was on howling abyss. It seems like the same group of champs just get picked over and over again and unless you have a majority of friends in the match you don't even get to play what you want. Putting this mode on a single lane map like howling abyss opens up other champs to be played. As it is this has been my least favorite featured mode.