This is the part that many people are missing. Decades ago I heard "the ideal UI is a search box," and I agree today even more.
I don't understand why people are still thinking that clicking on stuff will still be a desirable thing in the future.
I agree - we should have many more good fully-keyboard-accessible UIs!
I don't want to talk to my computer to use it.
What you’re describing is basically a terminal. We’ve had those for a while.
Inputs for the ui might be me talking, or typing, or having someone else talk or type. They might also be GPS, temperature, BLE devices nearby. Or maybe a button I smash because I don't feel like re explaining something.
What happens after an input is still the best part of a UI. We like seeing/hearing/feeling things in different ways.