They are proven to be highly effective at preventing severe cases of Covid-19, including the delta variant.
What we don't know (yet) is whether that efficacy will still be as strong 2, 3, or 5 years down the track. But that, IMO, is not a good reason not to get the vaccine today. Trust me, you don't want Covid!
I literally want it. I prefer the virus over the treatment if the chances are 99.9%+ that I survive it. I expect it to me more like 99.99%+.
I say so since the beginning (when there was no vaccine): let me get it so I can help in old folks homes.
But what I got was mandates/lockdowns and free mRNA treatments. Not taking the jab means lots of hassle. I see what govts are doing to us. I dont like that. So I resist.