I don't think I learn much from art. But I don't care -- I don't enjoy art and music to learn. It's a much more emotional and human experience -- and that has just as much value to me as learning does.
Slacking off and not getting necessary things done is terribly self-destructive. But so is cramming "learning", "goals", and "growth" into literally every second of your day.
I occasionally overwhelm myself with all of this stuff to learn, read, listen, do, and it takes a mental toll on me.
There is just so much out there, but we can't do it all.
:)
In the Arts there may be little specific track, but it is acquisition of keys anyway, and a fundamental one, because the consideration of art is the encounter of patterns. Pattern for your further recognition, application, and for your development in general as a "pattern-rich entity".