I hear what you are saying but I actually think this is the wrong way to think about it.

The point I was trying to make is that if you just learn a little bit of music, a little bit of football, a little bit of french you are still only learning the same and getting the same perspective no matter how many different things you learn.

The trick IMO is to dig deep into something as this will teach you how to dig deep into other things later. I.e. you are actually gaining perspective on other areas even before you learn about them.