Most useful for me has been the upgrade calculator on mhn.quest. Shows what cross materials to save for future upgrades so you can safely clean your inventory
I really don’t think, somehow, bizarrely, inexplicably, that niantic or capcom thought their built-in autistic monster hunter fans that do math for their damn video games were going to play this.
They probably also don’t want people to know how it’s going to take 12k zenny and 6 rare 6 mats to go from 7-5 to grade 8. Probably would kill casuals spirits.