I agree with everything you have said, but I guess the big difference between those two examples is that one is a reseller of some volume, and the other is a trainer. So, the question is what are their goals, and also their responsibilities? The second has the time and experience and education to bring a horse along and the first one is trying to sell horses efficiently and make a profit. So, buyers really do need to be somewhat aware of what they see (as you say: bent at the poll, being worked very forward, so the picture is a false frame but looks fancy), vs. what they will most likely get at home (some version of a coked-up giraffe with an upside down neck and other track gifts like weak stifles).
Anyone who thinks a horse right off the track is able to work properly over its back is…well, wrong. They simply do not have that form of muscle development, and some take more than a year to really develop it. That is where the education of the trainer you are talking about is so important, because all of the work that needs to be done to create true self-carriage and strength and eventually collection takes time and patience. But for a reseller the goal isn’t to have the horse long enough for those months and months of retraining, it is to get the horse going well enough to do some stuff with it, and show it to buyers, and then hopefully send it on the next home.
Unfortunately, it really comes down to the fact that buyers have to be more educated, work with a trainer who is, or be prepared to get something home that they may not be able to deal with the way they had imagined. My own trainer has had so, so many retraining projects and new students come in with OTTBs who didn’t get that good restarting foundation. Very often it’s all a big drama of buyer’s remorse and s/he’s crazy and OMG!1!!!1! until she helps them start over correctly. And then you get whatever is actually in the poor animal, waiting to be brought out with time and patience and knowledge.
ETA: thinking about my own new-ish guy (not an OTTB), he came to me with not much topline because he was a sales horse and teaching him more than base-level dressage wasn’t in the program. So he had all of the flatwork basics, had an auto change, and could jump and go to horse shows. This is what I expected, and this is what I got. Fast forward 4-5 months and ta da! He had a topline, he had bulked out particularly in that tricky area around the withers, and he could now begin to sit in the canter, work into the bridle confidently, and so on. It takes time! Again, anyone who thinks it doesn’t is fooling themselves.