You think you know what factory workers do. Right? Wrong.
You think you know what farmers do. Right? Wrong.
You think you know what oil rig operators do. Right? Wrong.
You think you know what coffee shop owners do. Right? Wrong.
You think you know what lawn care specialists do. Right? Wrong.
or we've been trained for 8 hours a day for 10 years by factory workers?
we've been working for oil rig operators for 8 hours a day for 10 years?
this looks a little like a straw man fallacy to me. go speak to someone who has worked in the oil field for years. oil field is a thing that has actually changed little over the years. you don't think they have a fair share of criticism and improvements to suggest?
coffee shop owners are probably the most dynamic of the bunch in your example. definitely much more dynamic than the teaching industry.
although we're actually in the process of a teaching revolution. a few top tier university are completely switching their study methodologies.
...or they could have just asked students 10 years ago, and asked them whether it makes sense to just read slides for them during the lecture. guess how many would have said yes.
But practically every day I hear some grand opinion of teaching from people who haven't taught a class, ever.
You don't know what it's like owning a coffee shop.
I guess that makes "math teacher" the most misunderstood of all :)