What I bolded is a myth. You need a stud QB or a stud defense to have a chance. More than anything you need great depth. You need players on special teams and the second team that can play against starters for other teams and at least hold their own. Because injuries happen in this league. If you put all your eggs in too few baskets you will end up decimated by injuries.
You are the typical Johnny come lately fan who buys the NFL's marketing and thinks that's what wins games. In reality, more games are lost than won. The team that makes the fewest mistakes wins more often than not. Jimmy Johnson knew that, Bill Belicheck knows that and Garrett knows that. Anybody who's ever won playing or coaching this game at any level knows that. It's the little things that matter. Eliminating mistakes is more important than making one or two big plays. Because if you eliminate mistakes, you eliminate big plays against you. The more talent you have across the board, the better chance to eliminate mistakes and force the other team into making mistakes - which is where big plays more often happen.
And you are so hung up on the money it's hilarious. Ask Green Bay about how to build a team. Ask Pittsburgh. How often are those teams trading up in the draft and how often are they spending big on outside free agents? How many times have the Eagles or Commanders outspent the league? What has it ever bought them? You can keep repeating yourself all you want, it doesn't make you any more right.
What you are describing is great for building the foundation.
Guess what, the foundation is already built.
We already have the depth.
We already had 49 real players on the roster before the draft and i am not even counting Moore the DL.
You cannot keep 60 players.
You need the couple cherries on top to get over the hump playing the top teams.
You need the daddy who demands double teams and make the DL overall more effective.
The small market teams did a great job with their budget.
Why constraint ourselves to a small market strategy.
The goal is to win, not show how smart we are by winning with one hand tied behind our back.