False analogy. The original claim of ~90+ effectiveness was against the alpha variant. The virus has mutated and the predominant variant is omicron where the vaccine is far less effective. Very similar to the flu vaccine where this years vaccine would be less effective against the flu strains of days gone by.
You do realize that the small pox vaccine also loses effectiveness with the passage of time?
The principal reason no one gets small pox now is because almost everyone got the vaccine. You do realize the same attacks being made against the COVID vaccines were made against the small pox vaccines? Today it is claimed that the covid vaccines will change your dna. Yesterday, it was claimed that the small pox vaccine would turn you into a cow. Then it was claimed that the vaccine contained all sorts of noxious ingredients like bat feces. Now the anti-vaxxers claim it contains luciferase.
I’ve heard from someone who works with m-RNA “vaccines” that they are easy to tweak. If that’s true, why isn’t there one for the Omicron already? Why do they keep pushing the one made for the alpha variant? It doesn’t work against Omicron, so why the push for boosters? It’s ridiculous.