I generally agree with the OP. But, it must be remembered that Nintendo's whoring out of Mario is in a whole different ballpark than everyone else in gaming. They shoehorned him into racing, fighting, sports, turn based RPGs, action RPGs, puzzles, party games, and just about every major genre out there, excluding shooters. I'm surprised Splatoon isn't set in the Mario universe, frankly.
Nobody else does anything like this. So, in some senses, Nintendo is the least adventurous.