Has there been any studies presenting/proving the 2-week-worry-window (I like the term!) effect? The one thing some people would use as "counter argument" is that initially mostly it was unvaccinated people that would represent the surges in cases (during the first shot peaks).

This is easily explained by just realizing that usually only 1 person per family would get vaccinated at a time. So Grandpa falls into the vaccination age range - he gets vaccinated, weakened immune system, thinks he's protected, goes out and meets some friends (of same age group, also recently vaccinated) and gets COVID, brings it home and infects all of his unvaccinated family members (could be 2, 3, 10?).

The trend is so clear in populations, anybody with some good machine learning skills should be able to create a predictive model that will show clearly how the amount of people in the worry window affects the COVID rates.