No. I think individual fingers are actually less precise than manipulating an object with the whole hand. For one, it's hard to see what's under your fingertip,

No. I think individual fingers are actually less precise than manipulating an object with the whole hand. For one, it's hard to see what's under your fingertip, whereas a stylus can be very thin. You're able to use more muscles and apply leverage, which reduces jitter and improves precision. Barring anatomical changes, I suspect external implements will be around for specialized work for some time.