What's the point of taking it to the "next level" if you aren't competing? The 80%'s are more likely to stay in shape their whole lives and not burn out.
I will draw an analogy using the game of golf.
Some people are content with going out a couple times a month and scoring in the 90-100 while some want to score in the 70s.
To go from being a 90-100 golfer (hacker) to a 70s golfer takes a lot of effort and time.
Yes, most people don't want to spend many hours practicing and playing golf. "Boy, I wish I could play better". Wishing won't make it so.
Doing anything on a high level takes mucho time and effort. Getting very high grades in school, great golfer, great bodybuilder, high flying businessman, etc.
80% is just ok. Not hard to do. Mediocre. You don't need a "Principle" to figure that out.
Doesn't require too much effort.