wotc is not, and should not, be targeting an audience well versed in great wheel cosmology.
Okay . . . who should they be targeting then?
Because you wanna know a secret?
On the surface I'd probably look like a prime consumer candidate, but in reality I'm not.
Yes, I'm an avid RPG player and GM. Until my recent move to a new state, I played a minimum of 25 sessions a year from January 2012 through July 2022.
But of the 300+ sessions I participated in during that time, exactly 4 of them were using D&D 5e.
I've spent a grand total of $32 US since 2012 on WotC owned IP, for a copy of the 5e PHB from Amazon in 2015, which I barely read, gave to a 17-year-old in my neighborhood because I knew he'd actually use it, and forgot I even owned until the kid moved to Florida and took it with him, and I wondered one night, "Whatever happened to my 5e PHB? Oh yeah, Neighbor Kid probably took it when he moved."
Even at the height of my 3.5 playing days --- when I firmly believed D&D 3.5 was the greatest RPG ever created and would have scoffed at the idea another system had anything even remotely interesting to offer --- I really didn't care about cosmology / the planes / "planeswalking" / planar travel encounters, etc. Even when I was their target market, you wouldn't find me arguing about settings/cosmology on an online message board.
So if you DO care enough to comment on D&D cosmology on an online message board, you're even more of their target market than I was in the years 2002-2006.
So why, exactly, shouldn't WotC be targeting a market of the ultra-hardcore folks who care enough to comment on D&D cosmology online?
Of course there are going to be some hidden detractors in their "optimal target market"; people who look like prime candidates but actually aren't.
- The grog-iest of grognards / OSR will appear to be in the "hardcore" RPG target market, but are unlikely to buy anything from WotC.
- Those who still play RPGs regularly, but no longer play D&D, as they've moved on to other systems that better meet their preferences.
- People who play D&D regularly, but other than the "Core 3" rulebooks aren't likely to purchase anything else.
Which, of course, is why OneD&D is such a big deal --- recurring revenue is the ultimate business "market capture" device known to man. You're no longer relying on a $40 or $50 hardcover purchase from 150,000 consumers every 18 months, you're getting $5.99 monthly from 75,000 subscribers, pretty much indefinitely.
To say that the "hardcore" market isn't D&D's prime customer base is disingenuous at best.