Interesting post. Some thoughts as a race coach and an instructor.
In youth racing u14 and down, yes there is pressure to get results - but not as much as you think. Parents tend to look more at consistency, textbook technique, IMPROVEMENT and BIG SMILES before and after practice and races. The physical size and athletic abilities of boys and girls this age varies HUGELY. We have compact little guys who have not grown yet and huge "Clifford the big red dog" types as well. So podiums are not always an accurate measure of "success." Clifford will regularly beat the most skilled but still pre-pubescent hot shots in a typical youth GS (flat and short).
As for coaching never-evers or the aforementioned "British School Boys"... Let me add visitors from India, Brazil, Southeast Asia, and Texas to that list. If your clients are once or twice a year skiers on vaca - teach them to navigate the terrain safely and board the lift. Keep them smiling. You are NOT building world cuppers. You are building REPEAT CUSTOMERS.
None of these clients is going the "get" keeping the COM heading down the fall line. They WILL "get" pretty views, a fun lift ride, and some laughs. They WILL get that the hill is only "steep" straight down is is rather MILD horizontally. IF they want to take up the whole hill making pizza turns with their lift ticket flapping in their face, that is GREAT! As long as they are safe and smiling and might come back!
Bottom line, you cannot "break" or "spoil" a beginner. Unless "improper" technique is regularly and consistently drilled into them, AND they ski more than a handful of times per year - what damage can possibly be done?
There is one more demographic - Mom and Dad are lifelong skiers and rippers and are impatient to get Jr charging through the woods with them. These groms take a little more LTC and a smart line-up manager will assign instructors accordingly.