> let classes that normally count for a grade just submit grades as pass-fail. Because what else can you do?
Schedule a single exam and that's your grade for that subject? That's how it should work anyway, credits for work during semester (or worse attendance) are not needed to evaluate if someone learned the material, give them an exam and done.
That's maybe something a school can do if exams are next week, or after.
At my school, tomorrow is the last day of exams. Most of the students have left campus. There's no time or mechanism to schedule an(other) exam.
Then you're testing how good someone is at exams as much as anything
Exams have performance variance. Otherwise you're only getting a pass/fall signal in any case.
That's just bad outdated practice. It leads to cramming and less remembering than of the demand is for students to do work and show learning and effort throughout the year.