EA Boss Says Mass Effect: Andromeda Got Too Much Criticism, Franchise Could Return

It gets pretty carried away when the setting then establishes that humans, a race that has not existed as long as, say, the salarians, are somehow more diverse genetically than everyone else.

Particularly odd since humans are on the low side of genetic diversity as far as Earth species go.

Of course, the real reason is to try and give some cover to the weak character creation for nonhumans. If the lore says that humans are genetically more diverse than asari et al, then the relative lack of variation in their appearances in-game is superficially plausible.