I don't see how playing on maps with a higher level of detail deters from the best player winning in all honesty. If both players are playing the map it's a level playing field. Even with clean versions of maps you don't get around stuff like 144hz monitors and such, which I personally see as a bigger advantage than these clean versions provide (at least on my fairly old rig).
I also don't like promoting laziness in mapping and just resorting to making clean versions of maps instead of the mapper actively trying to fix and optimize their maps. There are examples of maps that NEED clean versions because their arted up counterparts run extremely poorly but those have been without exception bad optimization (or for teammode maps, the game engine, more on that)
There's obviously also the issue of how much reflex is optimized, but no matter how much optimization the devs put the game through, the newest grey dp4 will NOT perform well.
Inversely, Monolith with 8 people will not run well either before the game is optimized better (At least I firmly believe I've optimized the map as much as it is possible with the map editor) or if I resort to a clean version. which wont happen for any of my maps.
So to sum I suppose I just want to see mappers actively improving performance on their maps before the community draws the conclusion that we NEED clean versions.