Its more that Arcsys just know how to make VERY varied fighting games in general. Like, Strive streamlined a lot (mostly for the better) but it is still one of the more technically complex fighting games out there. Sure you have some bog standard shotos and grapplers but a shocking number of characters don’t only play very differently but have completely batshit insane systems that other studios would build entire fighting games around.

French Bread (?) gets an honorable mention for getting a lot of those vibes with their Under Nite games but, because of the streamlined controls, most play as Shotos with an extra meter.

But yeah. When you are used to just going completely crazy to add a random character with some art you like, making new mechanics for a guest character isn’t a huge lift.