All of the PvE content will be repeatable in some form or another. You can even say that the majority of things that you’ll do in this game will be repeatable quests such as Bounties that will have you hunt specific monsters. The Diablo Immortal services are there to fight that. With that in mind, here are the typical challenges of this type of game:
Insane repetitiveness - means that players will get tired of doing the same thing rather soon.
Unfair balance - some of the monsters in these kinds of games are made overly powerful on purpose. That way, players will feel obliged to grind more to get more powerful.
Routine - daily, weekly, and other types of quests that can be completed more than once will have you log into the game on a daily basis doing your chores.
Things like that don’t allow players to really enjoy what the game has to offer—engaging content, adventure, and the feeling of overcoming something. For instance, Diablo Immortal boss runs, for instance, will help players feel like real heroes despite how much time they spend in the game.