May I recommend an addition or modification to the Stadia Speedtest while is says that it will "Check your connection" it is limited in that it doesn't actually check if the required ports are open and able to connect to the servers needed to use Stadia. It seems to be an issue for many users as it doesn't provide any feedback (makes it look like Stadia will work flawlessly) and when they attempt to use it they end up stuck on "Checking your connection".
1. Maybe a next part of the test where you stream a basic google owned game to confirm it works. This comes to mind.
2. A message explaining which ports need to be open in order to use Stadia
3. On the failed Stadia streams an option to change the stream settings, aka make it appear as youtube or google drive.
I tried the service on a couple public networks where my speed results were great but wasn't able to use Stadia all. I really hoped for this kind of coffee shop get together kinda vibe. Hell we all know we wanted to get some rounds in at school and or work too. These aren't solely my ideas and come from other posts I've seen and heard.