>>If it causes selective pressures that create new variants

Except that it literally doesn't, there is no data to suggest that it would, and I have no idea why this particular idea is repeated so much. Like I said in the comment above, none of the vaccines that we use have ever caused super variants to emerge. Zero. We don't have a super variant of Polio, or any other diseases that people get vaccinated against.

Polio is not a coronavirus. SARS has different mutation rate, so this needs to taken into account. Additionally cats, dogs and other animals can be infected and produce unique mutations, unlike polio.