With vaccine documents, wife and I booked our 37th cruise in September 2021. It has been 13+ weeks since our 2nd shots of vaccines. Zero problems. I am age 81.
I drove blind stinking drunk once in 1972 and ran a stop sign at full speed. No problems. Made it home just fine.
But still... ;)
Both of us only have anecdotal evidence other than what we read or see in the media. We just select different authorities to trust.