Antibiotics are, by and large, reactive. Vaccines are, by and large, prophylactic. I am the furthest thing from an expert in this field, but the herd immunity

Antibiotics are, by and large, reactive. Vaccines are, by and large, prophylactic. I am the furthest thing from an expert in this field, but the herd immunity from vaccines provides an entirely different protection than a 'toolset' of working antibiotics. My naive understanding is that if you have 100% vaccine coverage, it's simply way more unlikely that a virus or bacterium can catch a foothold of reproduction that would even make possible the mutations that result in resistance. And then you have viruses like influenza that are so widespread and elusive that they change annually. But we've gotten really good at responding to that rapid change as well.