Teachers are now largely unnecessary, COVID made everything done online. It turns out in person teachers are largely ineffective and replaced with a YouTube video. Schooling simply has not kept up, and the unions want it that way.
This is not that dissimilar from someone thinking that businessmen don't need programmers because they could just cut out the middlemen and copy and paste from stackoverflow. It's not real analysis its a powerpoint presentation and its not well connected to reality.
Compsci is a popular one where the concepts are far easier understood by a YouTube video than a smart board.
The ideas of what teachers do and what they actually do are entirely different. Teachers overwhelmingly are there to hand out assignments bought from a company. If you don't understand it, teachers don't care, it's keep up or drop out.