Yes, that makes it hard. I always want my kids to cover the material and respect the work the teacher puts into something but I don’t like a lot of busy work. Of course, whether it is busy work or not depends on how much material the student already knows or if they pick up things fast from reading.
I always assign things like, “look up any vocab word you can’t explain.” I would probably do the same thing and just assign what I wanted.
My kids are such rule followers that it would drive them nuts to not do what the teacher said but also be annoyed if it were an unreasonable amount.
I do find unreasonable expectations followed by students simply not doing them and no consequences a homeschooling co-op/group issue. Public schools would be in trouble if they assigned stuff and then failed half the class. Public school teachers actually expect stuff turned in and on time.
I tried a group discussion time last year. I thought it looked like an unreasonable amount of reading so I decided my son would do the literature but not the history readings so he was only reading half as much. When it was my turn to lead the discussions(parents each signed up to lead different discussions) I discovered few of the 24? kids had actually finished what was assigned to them. My son was disappointed in the discussion because it is hard to have good discussions with people who haven’t read the material.
So yes, I have seen this many times over my homeschooling career.