They're also by design inferior to other vaccines since they only target one specific antigen, rendering them useless very quickly against highly mutagenic viruses (like coronaviruses).
The quick adaptability of mRNA vaccines to new variants is a key advantage, not a weakness.
Their rapid development and adaptability make them probably the best type of vaccine for fighting quickly mutating viruses. This is shown by the rapidity and relative ease of development and deployment of bivalent vaccines. mRNA vaccines are one of the great technological triumphs of the American industry and science apparatus.
