Innovation isn’t just about inventing new techniques. It’s also about taking existing techniques and pushing them past how they’d previously been used.
Eddie Van Halen has been mentioned in this thread as an example of innovation, but nothing he was doing at the time was new, it was just the first time it had been done in a rock context. Two handed tapping? Vittoria Camardese was doing it and had developed it heavily in the 60s. Sweeping? Chet Atkins performed sweep picking live with Jerry Reed in the 70s.