Madeira seemed to find the modules worked well. But they has transitioned to modules years ago, not due to Covid. AP test takers usually get a block at exam time for preparation.
So a Madeira student might take a “year-long” English class in 3 of the 5 available modules. Each module is about 5 weeks long.
I have a kid at a day school with 9 classes crammed into his semester. It’s exhausting switching gears for his classes and assignments. This is extreme but I’m more sympathetic to a modular format after seeing this organizational challenge.