I'm pretty sure that what you are saying is somehow "rascist"; but, personally, I think it is logical. Which is why you will never find it in a public school. I have never understood this philosophy that if you have an "Education" degree, that means you can teach anything. It is ridiculous; yet, that is where we are today. No surprise as to the failure of schools when this is what they think. I remember talking to a woman who had been a teacher before she had kids and she was telling me that when she came in one year to get set up for that school year, she was told that she was doing the "special ed" class this year. She told them that she had no training in "special ed" and she was told that it was "her turn". This was years ago, and probably the first hint I had that something was wrong with the public schools. (My kids had Catholic education.)
There is a book by Thomas Sowell, can't remember the title, but, he stated that education would improve greatly if there were no such thing as an Education degree; but, that you needed to get a degree in something, and then the "teacher training" could be either a Masters program or a Certificate. I thought that made a lot of sense.
Generalization such as this is no different than ASSUME.......
While it is true in many areas, it is not true in all areas - and most especially not in states where the public school teachers are not union. My daughter just started 9th grade, but is taking geometry because she took algebra in 8th grade - her math teachers for both courses have Masters in Math. Her Honor's English teacher has degrees in English and her Science teacher degrees in Science.
I spent 12 years in Catholic schools in NYC and my daughter is getting just as good an education in public school in VA as I did, and far superior in some areas.