Teaching isn't an act of perfection. It's a learning process.
If someone tells me they didn’t understand an instruction I gave, GREAT! Then I know, and I can work on making it clearer.
If a teacher trainee gives me feedback on things they found frustrating in the course?
Excellent, the next round will be better.
Five out of five is flattering of course. But most things can be improved on and full marks don't give you anywhere to go.