I’ve once played lead, hoping for one day having time to try again, so I’m hurt. But, I have to admit that there’s being a bit of trueness lying within your statement as, just because of you are being able to impress a growth by only being able to play 3 chords, doesn’t mean that they gonna stay that way, sooner or later being filling bored by only getting standards offered. If you want to keep them interested, you, if not quitting, might consider throwing some single notes, arpeggios, some creative pentatonic in it. Throughout the time, I just seemed to have recognized that the real impressing musicians are those who have first of started trying to play an instrument by just trying blind, not by first of be learning the math in accordance of visiting some music school, giving you, if having proper tools, a way more intimate relationship towards experiencing notes as to the instrument you be playing, as otherwise when first be learning it by the book. As a school, learning notes as handling instruments by the book, be getting important when willing to communicate within as throughout your band/you’re being a soloist, moreover being important when willing to compose and to be understood by others being involved, which you personally don’t see and/or don’t play with by a daily basis. Whatsoever, each of them, an jazz- as an rock-player, may have their positives as negatives when it comes to properly/inspirational be playing a guitar, as both may look real shitted when giving them an unfamiliar instrument in their hands, such as an with different binding/scaling or even being fretless.