LogFAQs > #971881328

I think it makes sense on paper, but the bigger question is, how would it work if you're playing online most of the time? It actually seems a tad trickier to code than your usual pause button, since online multiplayer and single-player are fused into a singular experience:

* You're pausing = you go offline, the world pauses, and can't matchmake
* You unpause = you go back online
* You're invaded or invading = can't pause at all
* You're offline = you can pause anytime

The fourth bullet point seem the most easily implementable, though. If you start the game offline, I don't think it'd be hard to add a pause function.
Case in point, Sekiro -- which has no online -- has the pause button. Nowadays, I take it as a stylistic quirk anyway (fitting of the "Souls are hard" trope even).