My son is struggling with middle school zoom math courses. I hope he doesn't suffer in the long term because of it.
I think a lot of what people complain about with Common Core is bizarrely written school materials that were developed by some bureaucracy and don't make a whit of sense to an adult who already knows the skill, let alone to a kid. Khan Academy definitely does better on that count in my opinion, so it's a good supplement.
You should check out Khan Academy because it's well aligned to the Common Core. The general effect of the CA Common Core was advance the math curriculum by about 6 months.