Back then the NFL was still real football. Quarterbacks had to be willing to take a hit while standing in and delivering a perfect pass that often made the difference in the game(s).
Not just Dak or Mahomes; would Lamar Jackson, Bryce Young, Jalen Hurts or any of the more mobile quarterbacks in today's game be playing still?
Would they even have been drafted?
In the NFL of the early nineties and before, the physical toll playing quarterback took on players caused teams to shy away from smaller guys because their mobility would disappear as the hits they took began to take their toll on them.
Nowadays the NFL penalizes any player who gets too physical when tackling a quarterback so much that they are basically playing touch football.
So why are quarterbacks still considered the highest valued player on a team?
Let's face it; the quarterback is now the easiest position to play in the NFL.