But - unless you are selective about your choice of examples, "traditional" vaccines do not in general give "perfect protection".
You only have to look at one of the most common vaccines - influenza. And the same goes for many other vaccines that give less protection. Nevertheless these vaccines are well worth using, simply because they save lives and reduce pressure on medical facilities. Again, you just have to look at influenza. Or DPT, which requires a booster every few years, meaning that exactly the same issue you claim for covid vaccines should exist for these, two of the most commonly used vaccines worldwide for the last sixty years.
Oh, and no covid vaccines use "gene therapy", and not all, or even the most commonly used ones, use messenger RNA technology. This last had had a lot of press, because it is relatively new, having only been around for the last fifteen years or so. Its advantage is that it makes it possible to develop and change vaccines very rapidly so that emerging threats can be targetted quickly. This is especially useful for infectious agents that evolve rapidly such as RNA viruses.
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