QB is the position that good enough gets great money because what are the options for the owner?
Want to let Cousins walk and be searching for a QB ever since or pay him the market rate for a QB1?
Several teams took risks in this last draft with QB's and most will be right back in the QB pool within two seasons.
With Herbert, you can't point to accomplishments without regarding the most yards and TD's in his first 3 seasons, only surpassed by Marino, who never won anything but was always among the highest paid.
Cousins is the classic example. It has been shown that a team, as he has played with some strong rosters, cannot win a Superbowl with him unless he's carried to a ring in which case most starting QBs in the NFL would do the same. I.e., you do not pay a QB like Cousins. Washington made bad decisions in terms of his replacement but that's on them.
People don't want to hear it but Prescott is in essence a very similar QB to Cousins.
It comes down to fans being happy of reaching the play offs but not being able to progress further due to limitations at QB or whether they prefer to take a chance and move on striving for a Superbowl appearance. The latter served the Chiefs (Mahomes for Smith), Rams (Stafford for Goff) and Eagles (Hurts for Wentz) very well. Conversely, Washington have fallen flat on their face since they moved on from Cousins.
It's a risk reward scenario and it would appear the Cowboys front office is content in just making the play offs given they haven't moved on from Prescott.