This is no joke. I picked up a 3 pound package of garden variety 80/20 ground beef last week and it was over $20. Maybe I just don't buy it often enough to notice, but that seems far higher than even a few months ago. I would have expected to buy a modest cut of steak for that price.
First, pre-cut isn't that much more expensive. Second, cutting is an accessibility thing now? A kitchen knife and 5 minute YouTube video should have anyone being to chop/dice without much trouble. And once they learn they will only get faster/better at it allowing them to use whole veggies adding more variety.
Yes, it's a boon esp. for old people who live alone, have mobility or sight issues, and don't trust themselves to hold a knife. It's also a convenience thing, but as you said, the general population can cut things just fine and won't suffer much without it; which isn't the case for this growing demographic.
Whole Foods fresh vegetables prices are comparable to elsewhere, same with some dairy. However, everything else carries a premium and for budget minded people you need to avoid it.
The pre-chopped coleslaw mix is like 3 bucks for a huge bag. 1 pound of pre-sliced frozen peppers I think is $2. Some of it depends on where you’re shopping, I’m sure this stuff would be 50-100% more at Whole Foods the next town over.
These accessible food options come with a premium that I strongly suspect put them out of what a median income household can sustainably afford.