So what? Products improve. This one will too. Imagine seeing an ad on Youtube and immediately being able to play the game on your chromebook. I don't know that's what is going to happen and it can't work today, but maybe in a few years.
How about I don't pay the monthly subscription/for the controller and tell Google that "payments improve. Mine will too"?
I'm obviously salty because I preordered Stadia (against my better judgement) and it's terrible.
The overall quality is very beta (black screen in Stadia unless you disable hardware acceleration, which I have to do every time, Stadia can't easily handle multiple Google accounts, I have to change accounts every single time).
Probably worst thing is very Google-like support. Super long queues for "Customer Care", phonelines are closed at 10:30 AM because they're "Out of hours".