Given that herd immunity was not achieved before mutation occurred and spread — in no small part due to folks refusing to take the vaccine — it seems obvious that more vaccines would be required, as with the flu.

I’m curious as to your logic on why that should not be the case?

It’s unarguable that early communication on the virus varied wildly in terms of accuracy, which is also quite logical given an entirely new pathogen. But using that as an excuse to ignore the evidence-based information those authorities have since obtained seems short sighted at best.