Some thoughts. WDW has had "booking dining as a competitive sport" for awhile now. (Same as booking FP+ there.) I hate that about WDW, but it is what it is.
That was never the case at DL. Yes, a handful of things booked pretty close to immediately (special afternoon teas and some dining packages that involved entertainment come to mind) - but even those were usually "just check the morning they go live and you're fine." Other popular stuff was "you definitely want to book a few weeks in advance," but again, it wasn't like WDW where stuff went "live" and then vanished. So the DL system of "we sort of post dining 60 days out, maybe more like 45, not at a consistent time, whatever" wasn't really an issue (even if it annoyed the WDW faithful).
Clearly, DL has now hit the WDW model of "booking your dining is a competitive sport." (Which I also hate.) But what's worse is that the system and infrastructure AROUND booking dining hasn't changed. And that's not really a sustainable model.
Except... from Disney's perspective, everything is selling out, they're maximizing their reservation profits, so... what's the incentive to upgrade the system or make it uniform?