okay learning to read music is irrelevant if you want to sit in your basement and play gorillaz tabs all day, and yeah sure lots of famous guitarists couldnt read music. but knowing how to read it and understanding basic musical theory will help SO FUCKING MUCH when it comes to playing with multiple other musicians. I know lots of people that shred alone but cannot collaborate worth shit. pretty much everyone I know who can read music or has any musical training are capable of making music with other people. not saying its impossible if you have no training but it helps so much. there is definitely benefit in it. and 90% of people who have a musical career have training. sure there are rockstar anomalies but if youre comparing yourself to Jimi on the basis that neither of you can read sheet music, your head is in the clouds. i cant read sheet music very quickly, especially not on guitar, but after roughly twelve years of taking some sort of music lessons (piano, guitar, string bass etc), i can safely say that my general understanding of music helps me at least have some sort of direction when writing/jamming.
practice is more important than musical training and reading abilities, obviously. but your practicing becomes much more efficient when you really understand what you are doing.
/rant