Got me thinking how often is this even possible so I looked at the last 5 years based on top 5 at each position in Average Salary per Year.
2023: Buffalo Bills: Josh Allen (2), Stefon Diggs (5). 11-6, Won Wild Card 31-17 vs. Pittsburgh Steelers, Lost Divisional Round 24-27 vs. Kansas City Chiefs
2022: Arizona Cardinals: Kyler Murray (2), Deandre Hopkins (3). 4-13
2021: Dak Prescott (3), Amari Cooper (4). 12-5, Lost Wild Card 17-23 vs. San Francisco 49ers
2020: None
2019: Los Angeles Rams: Jared Goff (T3), Brandin Cooks (5). 9-7
So in 5 years, only 4 examples so a very small sample size. Of those 4, 2 missed the playoffs completely, a wildcard round loss and our Bills last year which anyone who has read this far into the post knows what happened. So I would say this happens far too rarely to make a definitive conclusion that a top 5 QB/WR combo can't win a Super Bowl but I would have expected better overall results from the other three examples in the last 5 years.