And to be fair, I understand what you're getting at. People categorise beginners as learners,and the statement "we're all beginners" is a reminder that we should all be learning. It does make sense.
The source of my strong opinion on the subject comes from the over-use of the "we're all just beginners" soundbite in the martial arts...it just really winds my clock when a very, very accomplished martial artist trots this out, whether its an attempt to appear humble and wise or to encourage actual beginners I don't know, but it just sounded smug to me. Which is exactly why I never say it to MY students!
By the by, what do you do that took 11 years of college and university? That's some SERIOUS flight time!