I'll give several examples of what I mean.
The PADI OW course standards don't state any performance requirements for the tour portion of the dive. The student can bounce and crawl through it and meet the requirements of the standards.
The student is never asked to do any dive related tasks like...replace a mask, initiate air sharing or whatever...in a diving context...ie while off the bottom and diving. Everything is (or can be) done while kneeling.
But, look at the standards for AOW, rescue, DM or instructor training and testing. It's all the same and they never get around to the diving part. No place in that progression is a diver required to be taught or demonstrate good diving technique. In the AOW course, divers sit on the bottom below 60 ft and do a puzzle for time (deep diving means deep kneeling), they sit in the bottom and tie knots for their S&R dive, They bounce and crawl through their nav course and that meets standards. There aren't any performance requirements related to how the student is actually diving. DM and instructor candidates are tested on their ability to demonstrate skills while kneeling and supervise divers who are demonstrating skills while kneeling.
The training standards give us no reason to believe that an instructor has been schooled or tested in any actual diving techniques that weren't introduced in the OW course. So, like I said...they do know their stuff as defined by the training standards. We know that any certified instructor should be able to do a demonstration quality job of clearing a mask on their knees but the only way to know whether or not they can dive is to test them yourself.