It’s depressing that no other devices are getting SteamOS yet, either as out-of-the-box or at least supported fully day one. Here is why I suspect we are watching it die a second time.
Valve hasn’t released it standalone, which is probably making these manufacturers nervous
If Valve is even offering it to the manufacturers, money is probably flowing one way or another, as professional service fees to Valve, or ransom demands from manufacturers entrenched with Windows
Microsoft might still be doing their usual anticompetitive crap, offering incentives to keep SteamOS off of as many devices as possible
We are going to be held hostage on Windows for years to come because this is delaying the critical mass for adoption. Even though there are all the other viable community distros, we need the brand to keep things moving.