This whole thread is gold, and good rationale for @Wizards_DnD to hire some anthropologists and sociologists to study their consumer base while they examine how they craft #DnD's core books. Because those surveys they're using now? Not going to give them good data. https://twitter.com/alyssavisscher/status/1331300756834578432

The thread linked at the end of the OP's thread is also a big flag that Wizards should be paying attention to. Every edition needs a handful of core supplemental books produced, books 5e hasn't put out. They're not there for the older generations, but instead for the newest one.

Not to mention that making these books would help @Wizards_DnD. How? They'd provide ready, in edition locales and tools to work with. They'd also mean that, even if only detailed in a single book, it's only one generation behind in terms of updating into the next edition.