As for point 1 and 2, it's what I meant, I didn't word it correctly, my bad. I think everyone with good art start from somewhere from 0, but with practice, they get good, and because they are used to putting effort into something, they are more likely to produce good games.
AI makes people skip this step, so people who want to make games but don't want to practice, can now skip the hard part, and produce mediocre games simply because they get past the art hurdle easily. This is my 2 cents, so take it with a grain of salt. As for your 3rd point, I agree and I support these developers.
Ultimately, I have a big appreciation and love for good 2D art and the artists and developers behind them, and I support them. Which is why I have a bias against AI "art".