So in the end I'm not sure what good will come of this decision, while it will definitely cause some confusion.
It's possible I missed something and that Zoom truly is notably worse than any of the common alternatives. I'm partially posting this in the hopes that anyone can point out whether this is the case.
And yes Zoom is definitely worse than a self hosted OSS solution like Jitsi (or even Jitsi without the self hosting) but we all know that that's not going to happen.
School's have IT. It isn't always competent IT (I speak from experience), but clear instructions from up high can lead it
IT people are hammered right now, nobody has time to futz around with some random oss tool that will further stress overutilized remote infrastructure.
Edit: If I'm honest I'm not even sure how meet.jit.si can function at it's current scale. Especially because I've found no way to send them money.
Sure other solutions might be just as bad but that is hardly and argument against ditching Zoom immediately. If you've missed the many articles about their weirdly bad security you should definitely go read them.
The one truly sensitive issue is the zoombombing, and I haven't been able to figure out whether that's truly a security bug or if zoom is just the biggest attack surface and has some terrible default settings.
At this point, I think it's more than fair to be worried about Zoom's security.