I've been very impressed with the ad hoc online learning our district has set up. (Disclosure: my last corporate job was working to help districts set up online schools).
Regarding grades, rigor and educational value, I think there ought to be an understanding of the social role that education plays. Tuesday, during my 'online office hours' a gay student stayed and showed me the engine she and her dad put into her pickup, and introduced me to her dog. Kids need connection, and this is very stressful to them.
Also, they've been doing work! I'm fortunate to have worked for a very established and thoroughly developed online school system, but even though we're making it up as we go along, we're doing the important thing: trying to help our community get through a bad time. Someday this will be over, and we need to start the work now.
Re: online meeting security, it's an issue. We use Google Meet and have some serious permissioning/oversight via district-issued login credentials, but still: they're teenagers. One of them has actually been forwarded to the police for their actions. But as I always tell people about this job - you know what? Most of my kids are great people, and if you're good to them, they'll be good to you.
Sometimes, just having a homework assignment is an anchor for a family who are dealing with a load of problems.
Anyhow, I got my document camera hooked up, my webcam on my receding hairline, and I'm gonna help some kids with math in a half hour. Or just vent, what the hell.