I already have a physical keyboard! So what will a touchscreen do for me?

Turns out that interaction shift actually enabled a lot.

IMO any individual (like you or I) are unlikely to immediately conjure up every possible high-value idea that AR makes possible.

Not saying those ideas necessarily exist (though I suspect they do), just that your lack of imagination isn't evidence against them existing and being discoverable in the next 10-20 years.

Just real-time text translation and annotating faces with names would be cool.