It isn't only guesswork -- there is a lot of reading and researching involved too. I figured that was obvious but perhaps it was not. The point is that it is learning by doing rather than rote memorization and recall. It is easier for me to do something, see the result, and figure out what went wrong if it didn't work. It allows me to understand the function behind something, versus just being told "this is how to do something and you should always do it this way" without an explanation as to why.

What works for you isn't what works for everybody. And I'm absolutely not denying the importance of learning theory.