some of this "merge into 1 button" button is actually available if you play the pvp. so that mean for some reason yoshi decide to make the pve button stay like that for some reason.

maybe for complexity filter i guess, i mean if they merge many of function into 1 button (1-2-3 combo into 1 etc) it probably going to look weird, what kind of mmorpg that you can play with only 1 hotbar (10 buttons) lol