I kind of knew the answer when I posted the question. It's also hard to properly price something like an audio plugin, right? Niche customer base, poor customer base (musicians)… the people making money, audio engineers and such, want to work on the "best" hardware for their job, which basically means a traditional computer.

I do believe that using a modern touchscreen interface to creative software unlocks more potential than simply using a keyboard and mouse. Touching interfaces to control sound just seems like it would hold a lot more creative potential energy to me.

If so, then what would really be revolutionary would be adding touchscreen to Macs.