Restricting yourself to even one guitar doesn’t mean you are playing only one instrument. Use a capo, tune it down, tune it up, remove two strings, play blindf

Restricting yourself to even one guitar doesn’t mean you are playing only one instrument. Use a capo, tune it down, tune it up, remove two strings, play blindfolded, play behind your back, use it for strumming, beating, slapping, switch up picking styles, switch pickups, modify the neck, use different strings etc - these all change the instrument to a degree that you could call it a different one. I‘d wager that people who don’t do this _and_ don’t use different guitars will not reach what people call mastery.