I haven’t played Galleria, but I don’t think a risk/reward mechanic necessarily means it encourages grinding. To me that sounds like a way to encourage being more engaged in combat so you can skip more later even if you could also use the same mechanic in the context of grinding.This is another thing that's great about Chained Echoes: There is no XP, only skill points. Level ups are gained by beating story bosses and advancing the story, and a few side bosses, that's it. So while you can sort of grind to get skill points and items/money or something, the impact that will have on you is VERY small compared to a level up and not worth it at all. So essentially, grinding is pointless, and since you can avoid most fights if you want to you don't really miss out on anything by doing so, either. It's a great system.
I will say, though, that while I dislike grinding most of the time, I think that it does have its place in specific games, mostly in the dungeon crawler genre: Labyrinth of Refrain/Galleria, for example, are practically designed so that you will grind, at least to some extent, because they give you mechanics for that purpose. Your runs through the dungeon are limited by your "RF" points, and there's a mechanic where you can choose to bank your XP from battles by spending one RF point per battle and it will put all of your XP into a pool and give you a multiplier for each successive battle; it's a risk-reward thing since if you die or escape a battle you lose it all. But if you can make it up to like a 3X multiplier and do a long dungeon run, your final XP total will be crazy good compared to what you'd get normally.
In general with dungeon crawlers it’s about exploring and knowing when to pull out if resources are running low so you can get farther next time. Some dungeons have mini goals to work towards like opening shortcuts to make trekking back easier. Are unsuccessful runs considered grinding where you accomplish very little? I personally don’t think so.
Grinding in a game is staying in the same spot and fighting the same enemies over and over and over again to force a resource to multiply whether that’s XP, gold, or drops/materials. I definitely do it some times because I want something in particular, but generally it’s never something that needs to happen to overcome a challenge.