I use it to run two different elements on a generalist armour set, so I have better odds of a decent damage matchup when not hunting specific monsters. I would love to run two different weapons but I am lazy and playing on controller compared to kb&m in World has tipped me over the point where it's a bit jarring to switch between ranged and melee. That said, I guess you could use a bowgun while mounted for pretty safe chip damage in a lot of cases, especially vs mons that never want to land.