Just so people know. The dTap vaccine are for bacteria. Tetanus, pertussis, and diphtheria are caused by toxins from bacteria. Bacteria are easy to vaccinate against. They don't really mutate.
Measles virus is pretty stable, but it’s still “only” 90% effective. Rubella is around 90%, mumps 75%, polio is around 90%. But they are that high because there’s not much of that virus that circulates because kids were vaccinated against those since the 50’s and 60’s. If COVID virus circulated at those levels, there would be very little break through infection. Covid vaccines stop infection too. Breakthrough infections are minuscule compared to the total number of people vaxed.