yes, but the way I played dominion didn't maximize my dominion winrate. I kept being annoyed and clicking on the next game button anyway, which is why I always performed worse on ladder than in the dominion league.
I agree that if you maximize your winrate, this will have desirable side-effects. I strongly dispute that this is the effect of playing a lot for most people.
Did you
want to be annoyed and keep clicking on the next game button anyway? Presumably not, and this kind of immediate negative feedback from the consequences of having failed at something you were trying to do (probably to win games, or to have fun or something) is extremely efficient at helping you learn to avoid doing the same thing in the future.
If you genuinely think playing video games has all these benefits, couldn't it be because you're an atypical case? I've never seen you on tilt so I don't really doubt your claim, but I feel like you're just unusually "gifted" in that your psychology avoids these traps and most people are less lucky.
As a child, I was godawful at losing at games/being unable to beat certain maps etc. and sometimes got extremely angry, like not angry enough to get violent at people or break things but I did sometimes have to physically take my anger out on things that wouldn't break, I cried a lot, etc. The fact that I don't mind losing games anymore and can rather enjoy the opportunity to learn from my losses is literally just from practice.
I have also done the thing where I keep playing e.g. Dominion past the point where I'm having fun anymore, but I used to do it frequently like 8-10 years ago and now I do it rarely; I don't even remember what was the last time I did that (with Dominion or any other game), probably like more than a year ago. I play generals.io more than any other game recently, and it is definitely more emotionally challenging than Dominion because of the fast pace and the fact that you can easily blunder games you were winning by far. And I'm clearly not perfect at regulating my emotions yet, because I am aware of having a bias where I'm more likely to watch replays and analyze games I have won or at least been able to put up a decent fight in than games where I have gotten REKT, but I the fact that I am motivated to win more games means I have an incentive to overcome this bias and I am slowly making progress towards overcoming it.