may find classroom routines, rules, and overall expectations overwhelming or confusing

Because they objectively are.

What are the hard rules that govern your child's classroom? What behavious is expected and how is it enforced? What is the grading criteria and how would a student go about disputing their marks?

The answer to all of these questions is: "whatever the individual teacher feels like that day".

I think the biggest outcome of Covid is not screen usage or permissive parenting, it's that parents saw their kids miss months of school and saw no noticeable decline in either educational progress or behaviour so they now know that the schools were doing nothing of value for their kids.