Two thoughts: Why have discreet values in the UI? Give me a slider, so I can set it just right! I've read that blind people set their screen readers insanely

Two thoughts: Why have discreet values in the UI? Give me a slider, so I can set it just right! I've read that blind people set their screen readers insanely fast: like, 10x or whatever. So, 2x seems like it might be a lot too low for the maximum?