Not true, coronaviruses have been around for more than the last 20 months, and vaccines for coronaviruses were around before that as well. In fact, in 2002 another virus called Sars which was a coronavirus-related viral respiratory disease had an outbreak. Because of this outbreak research began for a vaccine for that strain of coronavirus. COVID-19 is a novel form of the coronavirus, so there have been coronaviruses as well as research into vaccines for coronaviruses for almost two decades now. And the next point was covered previously in the thread already but the idea of a long term impact from a vaccine is flawed, as that is not how a vaccine works. It does not sit and stay in your body for the rest of your life. As the previous poster said: you wouldn't blame a stomach ache today on bad fish you ate 6 months ago.
This isn't some unheard of type of virus we have never encountered before, it's just a novel version of a type of virus we have previously encountered and researched vaccines for. You could argue an mRNA vaccine should be safer than a typical vaccine because instead of injecting the actual virus into someone like a traditional vaccine you are just teaching your body to produce the non-harmful spike proteins on the outside of the virus to teach your immune system to attack it in case your body ever encounters actual COVID-19 particles. But that is beside the point, the fact remains that yes people have known about other coronaviruses, maybe not COVID-19 specifically but they have been researched for decades, we didn't start from square one with this vaccine, in fact the reason it was created so quickly is specifically because of our work on the 2002 Sars outbreak.
This article explains the history and timeline of our work on the COVID-19 vaccine and how we created it so quickly pretty well. And the fact that 99% of hospitalizations are unvaccinated people and like it was said before only 4 people have died directly due to a COVID-19 vaccine and that is only 1 of the 3 vaccines we have been distributing to hundreds of millions of Americans. If we get out of this pandemic and a decade from now I grow a third arm because of the vaccine I will personally apologize for being wrong, but with all the information available now it is clear the vaccine is safe and effective and is our only chance of returning to anything resembling "normal." We won't ever get back to the real normal, much like how things were permanently changed by the events on 9/11 we will basically have a "before COVID" and "after COVID" sense of reality. COVID will hopefully just become something we're aware of and take extra precautions to avoid spreading it too much, I'm not saying permanent mask mandates or social distancing, but I do not see a future in which we can live and ignore the fact that COVID exists without overloading health care systems with patients and having thousands of people die every day from COVID.