You said that there is no research on class size and student performance, which is false as proven by the Google Scholar link that I provided. There are literally hundreds if not thousands of research reports on that general subject.

You refused to accept that. And now you dismiss out of hand all research, retreating to "I was a teacher". So, you formed an opinion based solely on your personal work experience, a sample of one.

Good teachers never stop learning and remain open to new information, especially that which is made available through research.