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> most people with the common cold coronaviruses only have mild symptoms.

Couldn't the same be said for the common flu? Most people shrug off influenza, but they develop a new vaccine for that something like twice a year (the efficacy of which isn't great.. https://en.wikipedia.org/wiki/Influenza_vaccine#Effectivenes...)

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The efficacy of the influenza vaccine has a lot to do with the influenza virus genome, which is fairly different than coronaviruses, and due to that mutates far quicker.

Yes but I think the flu shot speaks to the industry's willingness to devote a lot of resources over-and-over again to a vaccine for an illness that isn't serious for most people.

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