Jim,
That has always been my feeling. A flyer lie may mess up any player while not punishing the bad ones.
I played in the inaugural Las Vegas Celebrity Pro Am many years ago, and almost lost a ball that had strayed off the fairway by six inches. Caddy found it just in time, and Gary Player told me to hit up, since you never know when a shot will go in or close and help the team score.
Of course, its an argument for at least a graduated cut, but of course, this site would be generally against it as "too formulaically proportional." Funny how your mind changes when its your shot that gets caught by deep rough.
And, to your main point, the times I want to quit a round are when I am constantly in deep rough. And, I am a pretty straight driver. What happened to hit it, find it, hit it again?
My only other thought on rough is to make it just long enough to tell the difference between it and fairway, especially on blue to blue or Bermuda to Bermuda, etc., wall to wall grassing. Even then, there are plenty of times you could just mow it all the same height, if you wanted to mow an extra 50 acres an extra time or two per week. (Most don't)