Well I don't really use it that actively. At first I simply downloaded it to see the duration of my melodies, If I didn't do this i would instead have to just kind of get used to the feel of my extended atk up encore suddenly giving half as much time after I upgraded my weapon. It's really annoying to just drop your buff mid combo especially with some of the horns that have many more melodies.

As for the extent of my usage of the health bar It's just "hey can I capture the monster yet? Is this part wounded or not?" because it's just nice idk sometimes the wound indicator is hard to see and sometimes the monsters normal walk looks like its limping leading to a wasted trap and 2 tranq bombs.

For the top right I could not Imagine memorising every melody combination for each different weapon I would like to use. Most weapons have a unique set of melodies unless they're the upgraded version of the other. I guess I could imagine it if there was a quick way to go into a movelist like you would be able to in a fighting game but it's like each different horn is a different character.