The good news is that single-player games tend to age well. Down the line, the bugs are as fixed as they’re gonna be. Any expansions are done. Prices may be lower. Mods may have been created. Wikis may have been created. You have a pretty good picture of what the game looks like in its entirety. While there are rare cases that games are no longer available some reason or break on newer OSes with no way to make them run, that’s rare.

With (non-local) multiplayer games, one has a lot less flexibility, since once the crowd has moved on, it’s moved on.