Pls, dont just say "Won't work" without any explanation. Yes, it can be a bit tedious in MP, but me and mine friends done it too.
And yeah, I would strictly not recommend Communitas in MP, it is very random, you can have amazing starts and ones which just suck like spawning next to tundra and even ice fields. If you guys dont reroll, then dont play it. You can not just blame one little aspect of the game because of your map script, to balance this mod for every map script would be a gargantuan effort.
Not just Polynesia depend highly on the map script, look at the Inca, if they get HUGE mountain ranges, in the hand of a human player, they can be a huge pain in the ass. But Communitas for example can spawn quite few mountains at all, so the Inca does not have that much use of his UA and UI...