I find it unlikely that Apple would be interested in making a gaming brand. Nor is it necessary to have good, quality gaming on Mac.
I won't respond to the other things because I do agree with you and I think those have also been discussed to death elsewhere, but this is the gist of the problem, I think.
You may not think the lack of a gaming brand is necessary to have good, quality gaming on Mac. But... personally, I believe that to be the entire reason why gaming on Mac has not taken off for decades. Nintendo has... themselves as the gaming brand. Pretty much. Sony has PlayStation. Microsoft has Xbox and Games for Windows. I think you can kind of guess where I am going with this. Gaming used to be the wild west before 2000, and any brand could have some sort of gaming identity to go with it. But shortly after that, all of the major players established their own brands, with their own specific directions, and the rest is history now.
Apple hasn't gotten out of that mindset yet, or... perhaps they don't even care, and that's the problem. Gaming has become all about identity now. The reason why people would associate AAA games as PC games (not Mac games) is just because they have and want a sense of... identity. To many, a Mac computer cannot be associated with gaming, either because of performance, or because of lack of games, or because Apple doesn't care... etc... but whatever reason it is, it's clear the Mac lacks what can be described as a "gaming identity."
And because Mac lacks a "gaming identity", I don't think it'll ever take off. Developers won't just flock to the Mac now just because M1 beats a bunch of chips in performance and efficiency, or because it's easier to develop high-performance graphics. In the end, I think a gaming identity is more important than it looks.
But of course, that's just what I think. Maybe you are right, we may see more well-developed games on Mac in the future. I'll be happy when that happens, but for now, I'm not holding out hope that my ultra-powerful M1 Pro device is capable of any meaningful gaming.