There probably won't be any form of grinding in D:OS 2, unless some later arena has infinite fights and always awards XP. I mean, maybe that could have something like that to help people catch up if they're underleveled and have no other choice, but it shouldn't let people level up past what they should be around there. Basically, there could be a "training" option for people at a couple points in the game, where a NPC basically notices you're underleveled and to pit fights for you to help you grow stronger, an option that players won't have if they're the normal level. And presumably there will still be some kind of respecialization option (ideally also some way to to only move a few points around instead of restarting from scratch).
D:OS 1 definitely already had plenty of an XP buffer, assuming you were even remotely thorough. In fact, XP buffers can create just as many problems as no buffer. It makes people feel like doing all the side content will make the game too easy. This is one of those perennial problems of RPG design that's super difficult to solve, level scaling being one of the most effective if nonetheless quite unpopular solutions.
Otherwise, I dunno, do they need an even easier difficulty than explorer for people? Maybe something that reduces the level of all the enemies by 1 or 2, so it's easier for players to feel on par with enemies with needing to do all the content.
