We know getting the same shot four times in a row causes issues to rise and there are biological reasons such approaches can create immune issues, along with the concern around the other effects like inflammation.
This seems a plausible finding to consider, and that should concern everyone.
Yes... the boosters seem to be of most concern.
As far as lockdowns, even the States where they were supposedly tight, like here in CA, hardly anyone stuck to them... I was out every day the entire time and the sheriffs around here refused to enforce it regardless.