The plot is almost exactly the start of one of my favorite Onion Talks, What is The Biggest Rock? https://youtube.com/watch?v=aO0TUI9r-So

Apple grower here. I still don't understand Honeycrisps. I'm on the younger side, so I haven't seen that many years of Honeycrisp, but I feel I have never had a good one. My experience of Honeycrisp is that it is super crunchy, almost too much so, but completely devoid of flavor. To me, it's like eating crunchy water.

As others have pointed out, this article doesn't actually explain why (or even if) Honeycrisp has gotten worse. One thing I will add to this discussion, though I don't know if it is true in the case of Honeycrisp, is that it is definitely not a matter of breeding (nor selective breeding, breeding for storage, etc): in order to produce more apple trees, Honeycrisps (or any other variety) aren't bred, they are asexually propagated through grafting. That means all Honeycrisp trees are more-or-less genetically identical.

That said, just like any organism, as trees grow and produce new cells at the tips of branches, there is always a chance for a mutation. Sometimes these branch mutations (called "sports") have visible genetic differences: stronger coloration, earlier ripening, or perhaps earlier storage (though this is harder to notice). This is how Red Delicious went from a wonderful apple to tasteless, mealy cardboard: sports were selected over time that prioritized storage and color over texture and flavor.

As an apple grower, I have had the opportunity to taste Honeycrisps straight off the tree, and to me, they taste just as flavorless as the ones I get from the store. I grow almost all heirloom varieties, and I can tell you there is one that for me is head-and-shoulders above the rest: Wickson Crab. If you are in California, I recommend marking your calendar for September to search this variety out at the farmers markets (or better, plant a tree yourself!). There are many other wonderful varieties that stand out from grocery store apples. In a pinch, I'll get a Pink Lady from the store, as I find it's the most flavorful of the commonly available apples, but I find they sit heavy in my stomach in a way that homegrown or farmer's market apples don't. I believe this is to do with the fact that apples available at the grocery store are picked early, before the starches have converted into sugars, so the higher starch content may be harder to digest.

Hint: any apple with an "apple green" undercoat is underripe; to pick a ripe apple, wait for that bright green to mellow out or change colors. For redder apples, it can be harder to see, but most apples have some green visible under the red (Pink Lady is again a great example of this). And yes, Granny Smith apples are so sour precisely because they are picked and sold underripe; a ripe Granny Smith is yellow and sweet.

Some folks also report to having success using cover crops to restore soil, to mitigate the effects of HLB: http://citrusindustry.net/2019/11/18/cover-crops-bring-hlb-r...