[piloto_ciego]

It’s really not that hard - most of my career flying was single pilot IFR, and the issue was seldom confusion about the clearance - the issue I found more often was either “I was in a hurry” or “ATC was in a hurry” and we inadvertently generated confusion through mutual incompetence.

The solution is to slow down, talk clearly, and also - to be clear, there needs to be a service to deliver clearances electronically. The initial clearance should absolutely always be available as text, but on the radio in flight, I don’t see text being THAT helpful, except in cruise, but not much happens fast in cruise anyway.