Coming up with innovations just by remembering is quite a challenge!
A guitar in the hand of a capable player is certainly very cool. Violins also. And pianos, clarinettes and to an extent mouth harps, too, no doubt. (Even though even those and their numerous iterations had to be imagined by somebody at some point. Probably an invention like a violin would be really hard to establish in today's world - people would likely call the inventor crazy, coming up with something so unergonomic, compromise-ridden and difficult to learn.)
But here at KVR it can't hurt to show some sympathy and admiration for the expressive power of synths and controllers that help to bring this expressibility to life. Aren't we all believers?