Avram, I agree that the current question is: to what degree immunity by vaccine or disease w/ previous strains are effective against Delta, so old results are not appropriate any more.
Two things to note:
1) growing number of cases now affects everyone who was not vaccinated. I hear again, unfortunately, of people in dire state. You may want to check with people in your circle, esp, anyone over 40 and with any kind of health conditions, whether they are vaccinated. And I would not count on a mild case to provide protection, unless confirmed by recent antibody test.
2) it is clear that unvaccinated are threat to vaccinated, and government is not there yet. There are lots of unvaccinated workers in nursing homes and any other facilities for elderly. Check with your relatives and friends where they are. Maybe get them a 3rd vaccine without waiting for CDC.