How to Evaluate Accuracy Processing Results

I’m wondering that is there any way to know how datasets are well-processed, statistical report or something
how can I evaluate accuracy of processing result with / without GCPs
especially I wonder how to know & assess GCP is aligned, accuracy in metric and so on.

It’s a much requested feature:

But nothing available as of yet.

Would you be interested in contributing to it (or know of an organization that would?)