Just chiming in that your post matches 100% with what I've heard, seen, and read.
I'll add that it's one thing if some of the best self-motivated students are able to learn just by watching videos, submitting assignments, and seeing their autograde. It's another thing to expect this to work for 95% of the freshman class at Random University. Many will ignore the videos or not mentally engage, muddle through the assignments or cheat. Others won't have the meta-learning skills to identify where they're stuck and resolve the confusion.
So I'm not quite sure what you have in mind when you say "active teaching", but I completely agree at least with "interactive". At least the TA staff hours-per-student has to scale linearly. Professor time probably does too, but as you say, it's managerial.
I'll add that it's one thing if some of the best self-motivated students are able to learn just by watching videos, submitting assignments, and seeing their autograde. It's another thing to expect this to work for 95% of the freshman class at Random University. Many will ignore the videos or not mentally engage, muddle through the assignments or cheat. Others won't have the meta-learning skills to identify where they're stuck and resolve the confusion.
So I'm not quite sure what you have in mind when you say "active teaching", but I completely agree at least with "interactive". At least the TA staff hours-per-student has to scale linearly. Professor time probably does too, but as you say, it's managerial.