Max, while I would agree that video is a great tool to analyse technique, for me and tons I know, it's response a skier gets. How much effort and how skis respond provides the feedback they get on their skis. Maybe not everyone has the desire to be videoed, they watch, they learn or they don't, but they DO know what they are getting out of their skis...what they feel.
When buying new skis or demoing skis, most I know don't get videoed each time they slap new boards on but most riders will be able to identify how that ski performs and the feel they get tip to tail, edge to edge.
I don't profess to be HH or JC but one thing I have learned is that if I know a particular adjustment has impact on how I ski be it my technique, boots, canting, stiffness, mounting position etc etc etc.....If I recognize that impact and the change it can make, I will apply the ones that give me the best performing response....the feedback, the feel.
Moving a bindings mm or a cm fore or aft...most won't need days on end to confirm feedback...it can be recognized almost immediately. For me, in just a few turns the different response is noticeable. Working with a variety of skiers, I've seen this confirmed numerous times.
Feel at least in my humble opinion, IS ultimately what's it's all about. G