Isn’t prep more like a prophylactic, as opposed to a a vaccine?
I’m more familiar with malaria, where the preventative medicines are currently more effective than the vaccines.
"Prophylactic" is a broad-enough word to encompass vaccines, as well, so I'm not sure what you're getting at. It just means something that defends against disease.
The analogy to malaria is pretty on point. Pre-Exposure Prophylaxis (PrEP) is, you nailed it, prophylactic. It's not as good as a vaccine would be, and it's not as cheap as a one-and-done shot, but we've gotten to the point where you can get one shot every six months (lenacapavir) and, it's 99%+ effective at preventing infection. And, much like with malaria, the prophylaxis works— there is currently no HIV vaccine that reliably prevents infection.