@PAFMO I don't think anyone was blaming teachers. But you're very quick to blame the parents.
Lockdown was shit. People were stressed and scared. Trying to work and manage children. Trying to suddenly become teachers (for years, teachers have complained that parents don't appreciate their skills and effort but then are all surprised when parents can't magically become brilliant teachers overnight?!).
School provision and online teaching was erratic and inconsistent - I listened to a woman complain because her state-educated year 4 child was "only" getting an hour teaching a day. At that point, my DC had each had ONE half an hour group session with a teacher....).
Even children with relatively stable home environments, opportunity to learn etc, missed out on a LOT of socialising and things that build confidence, resilience and maturity in regular times (eg special assemblies, school performances, school reward schemes, sleepovers, playdates, trips out etc etc).
Many children weren't active and got more overweight.
Our children are going to feel it for a while. They are less likely to be independent. They are definitely less mature and struggle with friendships and other issues.
None of this should be dumped on the parents, most of whom did the best they bloody could.