I tried that my first few semesters teaching..... MASSIVE failure rates
Ultimately my job is to teach them....if they aren’t learning, I need to adapt my teaching so they understand, and if I have to adapt or add material, then I do it...... it’s like building a house.... if you don’t have a foundation, then the rest of what you build is just a waste.......
So if a good portion of my students don’t understand basic geometry.... everything I do with them for the rest of the semester is a waste.
I can’t send them back to high school to learn it( if they ever learned it in the first place).... but I can teach it to them now