It never posed a meaningful challenge in gameplay, though - just an annoyance. If you run too much, you have to stand still for a bit for your stamina to build back up, or chug a stamina potion if you have one. There's a reason it didn't make a return appearance in subsequent games.
It’s a non issue when there’s effectively zero penalties for death. On hardcore it’s more meaningful especially on hardcore challenge runs.
But that’s the thing if you’re only there for mindless slaughter then it’s anti fun, but also very close to a non issue.
Arguably the true successor of Diablo 2 is Path of Exile 2, but PoE 2 doesn't have a stamina mechanic for running as well. It's just an anti-fun mechanic nobody asked for
This tread claims that David Brevik, creator of Diablo, regretted the stamina mechanic too https://steamcommunity.com/app/2694490/discussions/0/6052961...