>Unlike measles or polio that remain fairly static, the whole Coronaviridae ecosystem is known to mutate enthusiastically. Most common colds are coronavirus with some people managing several colds a year as multiple strains circulate, even though their immune response will be protecting from the strain they already had. So depending on how it is identifying C19, a vaccine that is 95% effective against current strains may provide little protection for an upcoming newer strain.
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First, Fauci has already gone on record as saying the 2nd vaccination provides much stronger protection against mutations.

But if he's just "spit-balling", then if you'll forgive this rather silly question, why the hell are we bothering with vaccines? What value are they serving? I don't expect you to answer that directly, but I would hope "someone" would.

By the way, this is the entire sequence of events that likely leads to a large portion of the population concluding this is a "deep swamp bait and switch"....and we all know what happened a little over four years ago.