Chasing the part of growth you can feel starves the part you can't

Most growth has a felt part and an unfelt part. The felt part is the cost: the burn, the soreness, the strain of a hard problem. The unfelt part is the actual driver, quiet and undramatic. They are not the same thing, and they compete for the same finite budget, so optimizing the part you can feel does not merely miss the driver. It robs it.

Muscle makes this literal. Growth comes from mechanical tension, sensors in the fiber detecting load and signaling for more protein. Soreness is the byproduct of exceeding what you can recover, and a sore body spends its limited repair budget on cleanup instead of new tissue. Chase the soreness as proof of progress and you spend the budget backwards. The thing that built the muscle was [tension inside a recoverable volume](Muscle hypertrophy requires mechanical tension rather than muscle damage), the part you barely felt.

The same move runs in work. School makes [difficulty feel like value](School trains you to equate difficulty with value), so hard starts reading as ambition. But the driver was always leverage, and leverage runs on the same pool of time and talent that manufactured difficulty drains. A smart graduate builds a Hadoop cluster for a job a shell script could do: felt, impressive, expensive, moving nothing. The budget went to the byproduct.

So the rule is sharper than "the cost is a bad proxy for the value." The cost and the driver draw on one account. Spend on what you can feel and you starve what you can't.

Source claim: The felt cost of a growth process (soreness, difficulty) is a byproduct that draws on the same finite budget as the actual driver, so optimizing the cost starves the growth rather than merely missing it.