My kids’ former school isn’t leftist, but its full of lazy, over-paid, disinterested, bureaucratic educrats
They are getting rid of advanced courses because, I believe, out of sheer laziness.
I have often wondered if they are getting rid of the advanced courses because the "teachers" don't understand the stuff themselves; and, cannot do advanced work themselves.
How do you teach when you don't understand the material yourself. I don't disagree with your "laziness" comment; but, I think that it might also be a problem with the teacher not knowing or understanding the material so that they can't teach it.