The COVID vaccine is not sterilizing, meaning it does not guarantee prevention of disease. Instead it prevents serious infections that'll put you into the hospital or worse. The flu vaccine works the same way.
I absolutely will take a shot that turns a COVID infection from hospitalization into a bad cold.
These disks were designed to self-destruct in the presence of oxygen. They literally rust away.
Oxygen and its O2 form does like to sneak into everything. Even sealed in the original packaging, there's a limited shelf life. Flexplay claimed stability of only one year, which isn't much given it comes sealed in a plastic bag.