+1, it's all true. It's just you have to decide what to focus on, given the limited time and creative capacity. Everything serves you, you learn and experience new stuff and understand things better, but you may find "ok, this is as far as I was supposed to venture in the musical/guitar development." It's great to learn stuff, it gives excitement and depth to life (for example learning to play something did this to me), but one can't become a pro at everything. Sometimes you find you're skilled at something at early age, so it's pointless to focus on another form of art instead where you're lagging lightyears compared to the actual talents. That is if you want to actually achieve something. I saw there are 10 year old guitarists so good I could never become as good... so why struggle down that path when I already excel at another form of art?
I think it's best not to focus only on 1 thing in life, as it's not good to focus on 10 things. Human is a holistic being, one should find one thing from each of the important areas to take seriously. One form of art, one form of sports, one form of lifestyle... It's not my destiny to become a serious metal musician. I can still give my opinions on how to improve a song, albeit there comes a technical limit when it comes to instrumental theory or computer technology.
Auditive art even as music without lyrics can tell a story. Graphic art with just visuals can tell a story. Literature can tell a story. Each has its boundaries and capabilities. You can use all together when making a movie, for example. However, with literature you can trigger the mind of the reader to create these elements from his own mind, instead of offering them concrete, when the expression is limited. For example, a music video may ruin a song for you, because you had a more effective image of the song in your mind before seeing the music video...