I think there are 2 kinds of waivers, one medical which is done before the medical or interview?, and one religion/morals i-601 which is done after being rejected at the interview.
We did the i-601 based on moral conviction after the interview and got rejected. I think they wanted religious proof, like letters from priest etc of a religion that won't allow vaccines. I don't think they approve for moral conviction.
I don't think it will be removed from the immigration requirements. We ended up moving to Thailand instead of getting the vaccine.