All performances are complex, and when coaching, it is impossible to attend to every minute detail. Formative assessment - active coaching - is individualized feedback to improve overall performance. Evaluating that performance, is to focus on the performance as a whole.

I think a performance focus in important in a lot of fields because, ultimately, education is about what folks are able to do. Knowledge of things is not useful until it is applied to some problem or task. A performance focus could improve assessment across the board and shift teachers away from merely testing "content".

Assessment of process is commonly formative; while assessment of performance outcome is often summative, though formative assessments do look at performance outcomes too - from the perspective of informing improvement.

Imposter syndrom is common as people move into more specialized fields. It's common to hear about it from PhD candidates and from PhDs.

De-emphasizing grades

going gradeless