Why is Summoner’s Rift the only legit map?

It seems like this whole game revolves around 1 map. The meta, balance, etc. is based off SR. Yeah, ARAM and TT exist but they're barely a footnote and Dominion is dead. I would like a new map/mode that isn't just a rotating mode. Something that can be taken as seriously as SR.
Best New

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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