Any group that chooses to promote itself benefits thereby. If the left-handers at your company feel that left handers are more deserving and so select left handers for their teams, put right handers in spots where they won’t earn kudos, hire left handers nearly exclusively, and communicate regularly using left-handedism (obviously here real left handers don’t have a language right handers don’t commonly speak) then they have a bit of an advantage going up the chain.
For a more obvious example, how did it come to be that radical leftists now infest the top positions in academia, even though their ideas are destructive to any definition of logical thinking?