This might be better in the 'random thoughts' thread.
I've been playing guitar and bass now for 40 years.... doing all the 'twiddly-twiddly' stuff with my left hand, but when I'm not playing I can hardly stir the soup or paint a big flat wall with my left hand. How can I, on the one hand, be so dextrous with my left hand, yet, on the same hand, be so useless with it?
I've never found an explanation for this.