My concern with the mRNA vaccines is that for people whose first contact with covid (edit: through the vaccine) is that they are not going to be entirely foreign as the mRNA will be processed within the body and will essentially have self/non-self parts to it, i.e. it's possible that your body will both recognize some of it as self and some of it as non-self.

Luckily we have extensive data on the topic and it shows that the vaccines are incredibly safe. I find it funny that people are so concerened about vaccines when air pollution is a vastly bigger problem. People die of salt in their food all the time yet are super scared of miniscule vaccine risks.

As for the vaccines giving autoimmune disease that simply hasn't happened. As your article shows this has been researched for many years and these problems have been solved.