As a counterexample, some casual googling about cotton suggests that there is an ideal workflow which will result in superior cotton fibers before harvesting. Here is a quote from the conclusion section of the linked article:
"Cotton fiber quality is shaped by a mix of genetics, growing conditions, and field management techniques. High-grade cotton relies on precise measurements of fiber length, strength, and micronaire, along with maintaining proper color and cleanliness throughout its growth. These elements play a key role in determining processing efficiency and market value across the supply chain."
At the most basic, if one farmer harvests his cotton with no consideration of the above issues, whereas another farmer carefully studies, prepares, tests, etc based on the above considerations, wouldn't there be added value and added cost of production?
I personally believe that in a past era, farmers intuitively learned these factors and competed with each other to make their best harvests, and the bog standard t-shirt got a quality buff as a fringe benefit.
Whereas nowadays, the farmer has to drop quality for quantity to compete with digitally-connected markets.
https://cottongins.org/blog/ultimate-guide-to-cotton-fiber-q...