Correct me if I'm wrong, but they don't yet really have cross-platform support? Without that these games wouldn't be very fun. Also, I don't think Stadias current model is really designed to work with F2P games. Maybe if you have a Pro subscription that can pay for it.

Really though, what we have right now feels like an early access, and it's unfortunate how poorly they marketed it. Like, it makes no sense why I can't even use the controller with PC/Mobile wirelessly yet. The issues you mentioned too, all those things sound like they will be eventually fixed, but right now what we have is clearly unfinished.