The people who are stressed by it are the people who hold the opinion that Dak can't lead this team to a SB win, they don't want Dak signed at all, they think he's not a very good quarterback, never will be and if the team pays him market value the team is doomed to mediocrity for the length of his contract, or that the Cowboys won't be able to pay people around him.
In reality there are many ways to pay a player, some people look at the cost per year and/or the total cost and think the quarterback's salary is the sole determination of how good a team is going to be. They ignore the Dilfers and the Johnsons, who were not as good as Dak is now, but won SBs, or forget that the cap goes up every year....