

I would argue that if your games are already performant on the platforms you care about that you would get diminishing returns. The only reason to experiment with specialist asm would be for your own experience and enrichment which is a perfectly reasonable reason to pursue it.
It’s probably not worth comparing to an OS where even shaving a few cycles off of code that runs all the time on millions of computers across the world would end up with significant impact.

I’d argue that it’s self managed but not self hosted, it’s still running on somone elses computer and they ultimately control what you can and cant do with it. The distinction is murky though because a lot of the discussion here is about managing services rather than the hosting infrastructure (though of course there is some of that too).