ARPGs have basically been live games since Diablo 2 and only gotten farther down that route ever since.
If it is at the point where the developer can no longer justify maintaining the master servers, the game is (generally) dead as a doornail and the “100%” demand is a very small number.
I always prefer to have the option to do whatever I want with a game. But I fully acknowledge stuff like LAN mode for a live game is something that only benefits a small subset of players and is very much about “What happens after we have all lost our jobs?”.
Its the same reason that any studio that claims they will make all the DLC free or remove the DRM or whatever before they shut the doors are, at best, naive. And most likely lying. Because that is the farthest thing from a priority when you are trying to rip the copper out of the walls before you get called in for your layoff.