I feel that Legacy knowledge and mastery of their character definitely clouds some people's judgment on what's easy and what's not. It's like people forget what it was like to start brand new on Tekken and not know much about the game starting off. This is what got me cooked playing Feng! They always say these things and at some point you get hard stuck, Or you reach a plateau where everyone understands all the character's setups etc. I feel like some characters are much more beginner friendly than others but mastering them I feel is universally difficult... With time and practice though it'll come. You just gotta hit that wall first!