Did you just pull this out of your ass? The vaccine and antibodies from Alpha are both less effective against Delta but still provide protection. If you've had Delta though that protection far exceeds the vaccine. While natural immunity wears off over time it is typical far superior in the short term unless we're talking about somebody immunocompromised.
Also depends on which vaccine - J&J is like 30% against Delta.
EDIT: Just to be clear there is evidence of a huge benefit to getting a shot after previous infection, hybrid immunity. Not arguing with that.
I’ve only seen one report claiming vaccination was better than natural immunity and it was railed by multiple experts for being faulty.
Just the science behind it makes that statement impossible. Vaccination gives you one IgG Antigen. Infection gives you multiple IgM and IgG antigens, the prior being critical to prevent re-infection as well as t-cell memory. This would be saying having just one DB on the field is better than 4 Linemen, 3 LB’s, 2 CB’s and 2 Safety’s. It’s stupid and makes no sense.
This is why the CDC was pushing for no masks for vaccinated in March and April when Biden, Cuomo, and other idiots where saying vaccinated still had to mask. I remember the CDC director saying this exact thing might happen, that they needed vaccinated to get exposed while the vaccines were effective to build full immunity. Then that night Biden said the opposite and she acted like she never said it the next day.
The science is simple here, that one antibody is good for preventing serious illness/death as long as the virus doesn’t mutate against it, which it will and quickly because that is the path of least resistance. Really basic evolution, and viruses are a wonderful example of how quickly evolution can happen on a macro scale.
What nobody is saying is if the IgG antigen created by the vaccine works against delta or if it has mutated against it. I haven’t seen a single study on it. It’s very odd, and now you are talking boosters without knowing this, which would be useless.
We may have missed the window here. Without vaccinated getting hybrid immunity, lacking the IgM Antigens, they aren’t going to provide any protection for future variants.