Whatever marketing may say, I expect WotC wants D&D to sell well, for some definition of "well".
I don't know that anyone at WotC is under the illusion that the game can be for "everyone", any more than an automobile manufacturer thinks they can make just one car for everyone. Wildly popular? Sure. Everyone? I don't think that's an actual goal.
Design for everyone, and nobody will want to use it. Some choices need to be made.
IIRC - the original intent (way back in the beginning of the playtest) was to have 5e be extremely modular. With a minimalist core and lots of add-ons that could be fitted to supposedly suit a large number of playstyles. This approach seems to have been abandoned pretty early on, with the design team clearly leaning in a direction and sticking with it.
Considering how well 5e has done (is doing) I'm sure they don't regret making that choice!
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