Agriculturally rich nations are a little spoiled about food. A few years ago Europe even limited how 'ugly' fruit could be when it was being sold to the public, presumably because Europeans deserve pretty fruit.
For that reason, it's little surprise that there is concern about browning in apples. After being sliced open, the color starts to fade quickly, and in a hyper-vigilant culture where 99 percent of the public has never worked on a farm, parents and consumers may think that this 'browning' means the apple is bad. It gets thrown away, which leads to food waste.