I agree with this completely. It's one thing for the concept itself to be hard to understand. It's another thing for the concept to be simple, but proper execution to be tough, frustrating, and prone to error.
This is a really important distinction; I see a lot of people claim they don't understand something because implementation is hard. Sometimes implementation is just hard. They should note this more often in schools rather than taking an extreme position of self-esteem/whatever.
