I specifically use my iPad for the music because it's not the MBP I spend all day on for work. I'm sure there's music stuff that would be much easier to achieve

I specifically use my iPad for the music because it's not the MBP I spend all day on for work. I'm sure there's music stuff that would be much easier to achieve on the laptop than the iPad, but the second I open my laptop I'm basically on-call and the distractions too great - the separation helps. Do agree with the ergonomics point though - it can be hard to spend a lot of time actually working on it.