Something that strikes me as odd: there is very little representation of legitimate lowpoly mesh efforts in SL, a place that arguably would benefit from it the most if an entire region committed to it?

I've yet to see "N64 land" on the grid, but I've seen some places get close (like that one Portal game that has you collecting colored shards in a WoW-ass forest like some pre-teen on an early 2000s webgame).