I think it's more of the fact that most Disney sit-downs actually used to be pretty good if not better - so yes, there are still some good meals to be had, depending on your tastes - but they used to be the rule, not the exception.
If one looks at all the reviews from, say, the 2005 era - back when Disney Dining was at its height (just before the dining plan began the slow ruin of the parade), they describe amazing meals at just about all of the sit down experience at Disney. Remembering the food pron alone (before the advent of social media even) makes my mouth water right now, dining was really the focus of many trips for a lot of visitors. The quality, the variety, the portions - it was rare to leave a Disney sit-down without feeling you got your money's worth, even if it was pricey.
There are other factors, too - especially with the price perception. This largely depends on where you are coming from - if you live in a big city or some place where food is generally expensive, the prices at WDW have never seemed that unreasonable. If you come from other parts of the country or world where it isn't, you are going to think they are a lot higher. But even as someone who comes from the north east, where food has always been expensive, I can't justify the Disney price hikes PLUS the lack of quality and value that it used to feel was there. (Though food isn't alone, the same can be said for most of the WDW experience these days.)
One other thing I don't think gets mentioned enough either - expectations have changed a lot over the past decade or so when it comes to food in America. It used to be "oh, you get the real authentic cuisine at Epcot" and that was like, a thing - but in 2023, just about every small town in America (and certainly every place larger) has tons of authentic international and domestic cuisine choices. We have moved way past pizza and Americanized Chinese food being the only choices available to anyone outside of the major cities.
When the quality at home is going up, and the quality at WDW has gone down, it's not a huge mystery why Disney dining is now seen by many as an obligation, versus a pursuit worth half your vacation time to experience as it once was.