It's a QB league. How often does this need to be said? You are the one reducing this down.
The QB is by far the most important and difficult position to be elite in all of sports. There are far more people on earth who are elite enough to be astronauts, particle physicists, and heart surgeons than be elite QBs in the NFL.
Team building 101:
1) Get an Elite QB
2) Protect that QB
3) Sack the other team's QB into oblivion
This league is ALL about the QB, and the rules keep changing to enforce that even further.
The above reasons are why the QB gets paid the biggest bucks and why they rightfully have the highest expectations.