Players will also typically have done the work of putting together a wiki.

How important that is varies by game, but it can be pretty nice. For many roguelikes, having the mechanisms more-fully-documented can be important in making decisions about how to build out a character, for example.

Also, while I suppose this is less of a factor on console, and the impact varies a lot on a per-game basis, players will have often made mods. They don’t even have to be huge things either – but fixing the one quality-of-life thing that has been driving both you and the modders nuts can be awfully nice.