By reading his post, your questioning of "defining" what I mean has been answered. But I thought, naively that was already old news to you.
Honestly, if I have to break down tick by tick WHY PM's full system is technically(meaning precisely techniques)/superior skill-based play (not even considering metagames) than I'd have to sit here and type till doomsday. My best answer to you is, you boot up PM for about 5 hours, play it a lot, then come and talk to me about how it controls and handles it's physics/precision and timings vs. Smash4. Point I was making about Sakurai is, since PM totally and completely by orders of magnitude improved Brawl in every way, why not simply use that exact template as a base for Smash4 since it's almost universally preferred to Brawl. Why not give your biggest fans the benefit of the doubt that maybe they know more about how they most enjoy the game then build upwards from there.
But your point stands about most dev's being oblivious to the massive superior works of modders. Yes, they didn't create the game, but they made it as near perfect to what the community wanted as possible. Why not respect that firsthand at the start and say "hey, these guy's had the better execution, let's copy what they did, improve it and build upon it" = god-tier Smash4 imo. But only game that has REALLY done that if you've been fortunate enough to see that shaky cam footage is Doom(4), which with no doubt in anybody's mind take a TON if not 90% of it's ideas from the Brutal Doom mod, which again almost universally every old school Doom player myself included loved.