This is true in later education, but it seems to not be so helpful in earlier education. You're far better off with supervised practice than unsupervised, at-home practice in younger students.
The teachers hardly ever filled up the class time, so there was always time to just do the homework.
Typical homework loads today are waaaaaay over 5 minutes per class in MS and HS. Current high school homework loads are on the order of 10 hours per week in many places.
And in fairness, people like you or me, or most of Hacker News-- don't really count. We're outliers and not really predictive of typical experience.
If the school-by-zoom accomplished anything, it gave the parents a window onto what was actually being taught. They didn't like what they saw, hence the pushback in the PTA and school board meetings.