[acount6672]

I am a professor. The limit on the enrollment for my class in the fall, which will be online, is principally dictated by TA resources.

The TAs hold discussion sections (also online), hold office hours and grade exams. I don't think it is unreasonable to limit the number of students per TA.

There are similar restrictions on my time (I can only have so many students before it becomes impossible to answer questions in lecture or office hours). But I think these considerations are less restrictive.

Moreover, even if one doesn't care about how much work the TAs and I might have to do, it is very difficult bureaucratically to increase the number of students per TA. There are department policies limiting this number, university-wide policies, and union contracts.

Oh, and there are looming budget cuts, which will probably reduce the number of TAs available and lower maximum enrollments.