It's not nostalgia for a game, it's wanting to get back to plug-and-play gaming experiences.
With consoles in the 70s/80s/90s, when you put a game into the console and turned it on, you launched directly into the game. That immediacy is lost when you end up with endless software updates and having to launch games from a menu. If you didn't live through that time I can understand why you aren't nostalgic for it.
Most modern physical games don't give the full benefits I'm talking about, as you still have to install them and update them. I'm talking about games where the only thing you need to do is plug them in to a console and start gaming.
With consoles in the 70s/80s/90s, when you put a game into the console and turned it on, you launched directly into the game. That immediacy is lost when you end up with endless software updates and having to launch games from a menu. If you didn't live through that time I can understand why you aren't nostalgic for it.