Then this is just like any other RPG. Except make that acquiring demons.
You don't have to grind to progress in most RPGs. Sometimes it might be beneficial but if it's a regular thing and you're doing it for say, 30+ mins at a time, then you're doing it wrong.
With SMT it's all about getting good skills, and demons with good resistances help as well. In which case the only thing you have to do is spend time fusing rather than grinding (unless there's a really good demon you can get in a few levels, but again this shouldn't be a regular thing, and you might not even
need that demon at that point anyway). Now that you can just pick any skill you want instead of shuffling them, this should be easier than ever...