Yes, everything that I don't personally like shouldn't exist because there's no way it could work for someone if it doesn't work for me, right?
I am not a fan of cloud gaming, but Stadia as a service wasn't bad. As for owning games, you don't own your Steam games either, unfortunately.
As glad as I am for Valve supporting Linux, the real practical difference between Steam and Stadia is that Valve has proven it will keep it around. But in terms of ownership there's hardly a difference.