South Korean here. In put lag is still a problem so...

"It just works."

They didn't even release it in my country since our internet speeds wouldn't be good enough for it to work.

IMO: Are you in South Korea? Yes: Stadia works. No: Stadia doesn't.

If they ever launch it there, that is.

IMO: Are you in South Korea? Yes: Stadia works. No: Stadia doesn't.

I think the real issue is that it is unlikely that Stadia will be able to hold its own against preexisting competitors like Steam, and it might well be doomed to fail and disappear... And if/when it does, it will just wind up taking whatever games and money you invested in it with it.

What bother me more is, if you are the kind of person who fill all the circumstances, you probably can afford (or already have) a console or better.

No joke. You need a comically long list of ideal circumstances for Stadia to work properly, and be sustainable.