I definitely feel your sentiment for Esprit as it too am not liking DNCs focus on rng. Now I have no problem with Esprit being rng but I do have a problem that there is no way to guarantee it's accumulation. I think if they made it so that Flourish also made it so that you had your flourishes had a 100% chance of building Esprit I would feel better. I do understand that Improvisation builds Esprit but that is during downtime not when you are in the heat of battle.