The majority of grumbling was A) omg they've killed the app I was heavily invested in, B) the new thing looks a bit like iMovie and doesn't yet do everything the old version did (so don't upgrade yet) and C) omg they've changed the editing workflow a bit and I don't like change, change is bad.
It was only B) really, though. They released a "lite" version masquerading as an upgrade.
You don't have to write songs. The world doesn't want you to write songs. It would probably prefer it if you didn't. So write songs if you want to. Otherwise, dont. Go fishing instead.