I guess the point is that (and I would quote this but the OP pulled the thread) you introduced yourself by telling us how you got paid a lot of money to do some "good thinking" and you liked to research things and proceeded to tell us what was what about covid vaccines and we thought you were some kind of unquestionable expert, but when we saw you couldn't spell we took as a sign that you were fallible like the rest of us and we could relax a little.
You quoted, I believe OED's, definition of a vaccine, reliable source. Interestingly, the CDC recently revised their definition of a vaccine from promoting immunity to protection. Some would claim convenience on their part, and that could very well be. I think most people familiar with the subject would say a vaccine stimulates antibodies. If you want to use the term therapeutic, fine. Without getting into incoherent conspiracy ramblings, I would say that it is worth it to try something. I would propose that the real concern is that the antibodies produced by the disease itself seem to provide weak or short lasting immunity. I'm not sure if artificially induced antibodies can be expected to do better.
Maybe there will never be useful immunity. Maybe the best hope is the diseased mutates into something harmless to its host.