It asks the question "What is the point of a principle?"
I dont think calling privacy a principle is true if you are willing to give it up for something that "just works" - I believe covid is likely one of the biggest problems in the modern age, but during times of hardship we need to cling ever harder to our principles, or consider that maybe it isn't nearly as important to us as we thought.
Preface or not, it still reads like that. You're extolling one principle. I entirely agree that privacy is important but should be upheld. But there are other conflicting principles at work here - the list here is in no way complete.
* The right to privacy.
* The right of pupils to receive an education
* The right of teachers to limit the amount of work and energy they need to put into their work.
* The right of teachers and pupils (and the general public) to stay at home and evade infection.
And that's why your absolutism on one principle to me still reads flip - or at least ill considered - even if you preface it with "I don't want to be flip."
* The right of teachers to monitor their students activities during class.
(Also: Your list is unreadable due to the use of code no-wrap formatting. Please don't use code indents for blockquoted normal text.)
Your answer sort of reads as if the choice of technology is the only friction people are currently dealing with. The situation isn't easy, even using some easy to use technology like zoom. Adding friction will only make things harder for people doing their best in already hard circumstances. It may well exceed their mental budget for friction.
I wish widely deployed privacy-respecting solutions were already deployed at scale, people trained in their use and a suitable curriculum available. But that's not where we are and putting more load on already well loaded people will not improve the situation.