I mean, it's useful if you need to quickly express something to a fellow musician, like, "just give me a I-IV-V Gm four bars loop". Everything goes quickly out

I mean, it's useful if you need to quickly express something to a fellow musician, like, "just give me a I-IV-V Gm four bars loop". Everything goes quickly out of the window once you get into the production side of things, of course.