That makes more sense considering Valve still hasn’t released anything SteamOS related other than a recovery image.

It’s a preservation thing and a collectors item. As the hardware ages and begins to die, playing the games “as they were originally intended” becomes more and more inaccessible.

How would you say a new game released for a definitely retro console, or a retro game re-released on a modern console fits into this? Or even emulators?

So a new game for the NES in your opinion wouldn’t be retro, I can see that argument for sure. In the case that the new game is made to be played on original hardware and made with all the same limitations as games had back then, would you consider that to still be “retro gaming”? If not, would you say the age of the game is the most important factor or is there something else I’m missing?