It certainly makes it harder if you don’t have a great QB. Brady (6), Peyton (2), Big Ben (2), Mahomes, Brees, Rodgers and Russell Wilson have won 14 of the last 19 SB’s. Other than that you have Eli (2) and Flacco (1) who had unspectacular but solid careers and were clutch in the playoffs. Brad Johnson was a journeyman but had a defense with like five HOF’ers on it. Foles only had to win three games in the playoffs, two at home. All praise to him for doing it but Wentz did get them in position to be the #1 seed by playing at an MVP level for thirteen weeks.
If you count Eli as a HOF’er (he’ll make it whether we think he’s worthy or not) that’s 16 out of 19 won by HOF QB’s. Before that Dilfer with an all time great defense but you also had another several years of Aikman, Elway, Favre and Steve Young winning titles.