Did you ever face the situation that you trained a technique over and over, again and again and it just straight out refuses to come out during free play? Then you know the frustration if expectations and results don't match.
Failing time and time again, because you can’t pull of what you should be able to doesn’t feel nice. It can be devastating and lead the most dedicated of us down a path of frustration. It can be a reason why people quit HEMA altogether.