> The “fewer the need” is really a binary 0 or 1 I can see several ways in which this is not true. For one, several different variants might need to be handle

> The “fewer the need” is really a binary 0 or 1 I can see several ways in which this is not true. For one, several different variants might need to be handled with several different vaccines. Vaccines might also not work perfectly on a variant, but they might confer some protection, leading to overall less total viral particles produced, reducing the probability of an effective mutation.