Lessons I've learned so far.

Lesson 1)
Don't raise a raiser with AQ. Because he might have AK. AQ is dominated too easily. Fold AQ to a respectable PFR.

This is highly dependant on the number of players and stack size (as is everything else in poker)
On a full or close to full tabke you are correct.

When the table get short handed (5 players or less) it is often incorrect to fold AQ to a raise