The end result is the most important. Not what happens in confined water. If it makes more sense to kneel and show the valve drill then kneel and show it, then build on that. Don't hover in front of guy with only ten dives while you show off, it smacks of arrogance.
The Discover Tec has a minimum of 10 dives for entry, Tec 40 has 30 dives. IANTD Adv Nitrox is 25 dives as is TDI's. It is reasonable to expect the people entering these courses with the minimums to have a good level of diver ability, but not a great one. That is what the instructor is there to teach. What they get paid for in essence. Tech courses are not there to task load unreasonably, they are there to stretch the diver in order to better themselves. To walk into a class and have the instructor demand that you perform the following series of skills in horizontal aspect with a variation of only .5m is akin to military drilling and serves no benefit for the average joe diver.
The C-card is proof the person has achieved the standard, note achieved, if they walked into a tech course being able to hover flawless while performing skills, why on earth are they taking the course in the first place?