That is absolutely a massively distributed pedagogical failure of outstanding degree. Unless the average adult is so mentally disabled that acceptable-or-above teaching should result in this outcome.
When I was teaching programming I realised that by best students were going to become excellent programmers regardless of what I did. Like, if I literally didn’t teach them anything and left them to just goof around quietly on their computer on their own, they’ll still end up great. Teaching still matters. (Maybe more). But the difference is 10/10 meets expectations and 20/10 exceeds them.
Weaker students essentially could not learn the material without both of us working really hard to get them over the line. For the weaker students, the default is failure unless a lot of things go right.
And so as a classroom teacher you have the devil’s choice - who do you pay attention to? In a large classroom some people inevitably get ignored or fall through the cracks. And in school the problem compounds year on year. Learning issues tend to take a lot longer to fix than they do to create. Didn’t learn calculus last year with everyone else because your home life is a mess? Now the only way you’ll learn it is with 1-on-1 time with an overworked teacher. That didn’t happen? Now you have panic attacks when you think about it. And home life is probably still a mess.
I’m not apologising or excusing anything. But it is a hard problem. I don’t believe the same philosophy of teaching which created this problem is equal to the task of solving it.
Except now we don't even have the latter. We've just accepted that the least qualified individuals in our society are charged with doing what is arguably the most important work outside of governing, and with a laughable wrong headed course of training.
I probably worded it very vaguely.