Sekiro

For those who want that challenge, playing on a harder difficulty would still provide it. It literally wouldn't take anything away from you. Has anyone actually asked what we actually want, or do you just assume we want to give ourselves infinite health and damage? For some bosses, Bethesda style damage scaling would be a welcome addition. Bosses taking a longass time to kill doesn't make the game any better, it just filters out people who don't have hours to grind through a single enemy.

It could be implemented the same way Mortal Kombat tends to do it, where the more often you die to an enemy, the less often that enemy attacks. Turning off that kind of adaptive difficulty could still give players like you the high you get from beating a boss after 12 hours of attempts, while allowing those of us who actually care about the story to move on after dying a few dozen times.

It could incorporate multiplayer the same way Dying Light did, where you're able to play co-op without being invaded unless you want to be invaded. If you worry that nobody would ever turn on invasions, ask yourself why that is. Is it possible that most players don't actually enjoy that aspect of the game?