Thank you recceguy, obviously some knowledge of the subject
Having seen myself the ridiculous boasting about those "flight tests" by some of our colleagues more proficient about SOP calls and FMC pages than with real aircraft handling, I can do nothing less than 100% agree with your point.
Maybe a dedicated company or government body to perform those acceptance flights should be the answer, rather than company pilots unfitted for the task ? (but then, who should pay ?)