Makes sense. The PS4 came out in 2013/4, and in 2016 Sony restructured their games division, and it's now managed in the US.
I don't think the team being US-based is enough to explain why did they choose to unify the layout, only why did they unify on the western one.
Sony and Nintendo aren’t competing for the same market segments in Japan, so Sony made the PS5 western and exotic.
Also Xbox is quite unpopular in Japan, so Sony might think that unnatural O/X swap is still fine. It seems to proven true for vs Xbox, but PS5 isn't much beloved.