This is actually a great point - I think this is a one-way vs two-way communication issue. With a lot of our current input devices, tactile feedback helps with

This is actually a great point - I think this is a one-way vs two-way communication issue. With a lot of our current input devices, tactile feedback helps with verifying that the individual "packets" of information are registering, but visual feedback is key for knowing that the high-level command worked / didn't work, and what other options are discoverable. And the fact that the visual feedback is extremely high bandwidth is key. Imagine being read everything on the screen. Come to think of it, screenreaders are hard.