My kids didn't get shite out of the online experience and weren't engaged at all. My normally active, interested, happy children became distant, sullen, morose. It was heart-breaking. Their grades were fine but they weren't really getting anything out of it.
They're both back to full time in-person, and the difference in their demeanor is like night and day. But because their teachers are still supporting online learners, it's more for social reasons, than for scholastic ones. I'd say they're still only getting maybe 50% of what they should be getting from full-time in-person teaching. Which I guess is better than the 5% or less they got from online-only, but really not worth all of the effort and expense that everyone is going through to deliver that minimal value.