Yes there is a problem with representation in general in gaming, in media, and in many walks of life. To this extent though? That is a decidedly Nintendo problem. Trying to paint it otherwise is letting them off the hook. Specifically, there have been no shortage of fighting games released over the last decade or so. The genre has seen somewhat of a resurgence. Many of them coming from Japanese developers. And yet I can't think of any other ones that somehow end up having ZERO black/brown representation. And this is with rosters far smaller than 90.
That's definitely true. Twintelle over minmin was such a braindead easy decision because not only is twintelle a cooler character she also adds diversity which is a win all around. No excuses for that.