A less effective vaccination keeps COVID around longer and farther than a more effective one, though, giving the virus more time and population surface to mutate into further variants. (But still less than no vaccination.)
I'm not an expert in this, so I cannot say how significant that issue is, but this is at least one potential downside that I am seeing to the vaccination being weaker for that variant.
EDIT: To clarify since some have misunderstood: I did not assert that the vaccination causes higher mutation, quite the opposite. I asserted that the absence of vaccination (entirely or effectively) gives more opportunity for mutation. I understand now that there are higher order effects that make this more complex.
I'm not an expert in this, so I cannot say how significant that issue is, but this is at least one potential downside that I am seeing to the vaccination being weaker for that variant.
EDIT: To clarify since some have misunderstood: I did not assert that the vaccination causes higher mutation, quite the opposite. I asserted that the absence of vaccination (entirely or effectively) gives more opportunity for mutation. I understand now that there are higher order effects that make this more complex.