Do you think they'll ever add more actual battle system mechanics to Limbus (Not more Durante skills)? I'd personally love to see a Positive/Negative emotion system for Ruina so there's some decision making on whether to grief your own clashes to work towards a specific effect.
Actually, other than Durante HAS there been another actual system mechanic added? Closest I can think of are Clashable Counters but that's arguably not a system level mechanic.