I think he was super intelligent, not to release some pablum jazz, showtunes, coffeehouse, bluegrass - he knew those are a) tiny markets, 2) the definition of those styles is fixed, so anything so classified, is a repeat, 3) a master artist doesn't do things just because they can. He made his statements that cover the creativity and virtuosity essential to all music, and thru shear will and intellect, got the LP-buying world to like harder rock again. Without using his voice or hips. That was a heck of an accomplishment, especially in the disco-drenched, synth string pad 70's. And to double down, he created one of the most recognizable opening riffs with a synth.