FWIW, I'm a huge fan of both John Lee Hooker and Jimmy Reed, who had similar vamp-based playing styles and were untutored, couldn't read music, &c. One of my guitar teachers knew Hooker and he even imparted "the secret of the guitar" to him, which he then passed down to me.
But yeah, feel, instinct, and having good ears can carry you a long way especially for solo artists. I'm still glad I can read music and wouldn't trade that for (almost) anything, though.
Yeah absolutely, I'm not arguing against theory by any means. I'm happy I know it, but often times I wish my early music teachers spent more time with me on following my ears than whatever it was they were trying to do. It wasn't until I was an adult that I found someone that really cared about that.
But also... what's John Lee Hooker's secret of the guitar??? Don't hold out on us!
It's supposed to be transmitted orally, like a story from Homer or something, so I won't copy and paste it here, but you can find it easily enough by searching. Basically, without quoting it word-for-word, it's old bluesman advice from the "diddly-bow" era that when starting out on guitar, string it with one string only and play it until you can provoke emotion from an audience with one string. When you can do that, add another, repeat the cycle, add another string, until all six strings are on the guitar.
But yeah, feel, instinct, and having good ears can carry you a long way especially for solo artists. I'm still glad I can read music and wouldn't trade that for (almost) anything, though.