Farmers select for traits that increase profit. Since most markets don't let customers actually taste the product, they aren't choosing to buy it on that quality, and no one in the commercial space is trying to optimize it.

Instead customers are buying fruit that LOOKS good - big, bright, colorful, blemish-free (survives transport without damage).

So farmers plant fruits that will look good, survive transport, and have large yields. Unfortunately optimizing those qualities tends to get you terribly bland tasting fruit.

Ironically - pre-industrial revolution, when most fruits were grown and consumed locally, it was the opposite - people tended to select for fruits that were good tasting.