[split] Map discussion

[Lantry]

That's not really the bit I'm concerned with though - the lack of diversity in the maps being played is.

This is probably because most people don't like learning a new map - they prefer to play the maps they know because they do better on them, which they like.
Of course, the people you hear on the forums want new maps because they are mostly the more experienced and devoted players, who are looking for something new.
Also, it's easy to ask someone else to do something for you.