you can have a perfectly good experience using commercial streaming services through a browser (on x64, at least)

I disagree. Even if it was “perfectly good” as you say, there is still no remote-centric interface, which is what this project purports to provide: “It is designed to be used with arrow navigation using remotes or controllers”.

you can do a lot more things than just stream video when you have a computer hooked up to a TV. Games are an obvious choice

TV devices exist for a reason. The reason being they are extremely energy efficient. Consuming <10 watts, while your 5090 gaming PC will be using 50+ watts the whole time.

Further, PCs don’t support turning on with a remote/controller or HDMI-CEC (turning on the TV when powered on).

I’m certainly not arguing against its’ existence but there are too many problems with this usecase that it cannot solve for a variety of reasons outside of its’ control and it would be a disservice to advertise this software without also making users aware of it’s many shortcomings.