"Don't take the unproven, unjustified drug" is the default position in medicine. You are trying to shift the burden of proof here and it's embarrassing.

YOU are making at least 3 positive claims when advocating vaccination for those with prior COVID infections:

1) COVID natural immunity breaks historical patterns of natural immunity in similar infectious disease 2) People with "only" natural immunity are at significant risk of severe reinfection 3) There is a risk-adjusted, significant benefit for those with "only" natural immunity to get vaccinated