I love D necks, they are my favorite neck profile.
However I just went on to Fender's website, clicked "all guitars" (this doesn't count squier, more on that later.) and then filtered it down to guitars with D necks and it came back with only 6 guitars out of the 143 guitars that are currently in production. All of them being close to 2000 dollars.
So, then I clicked on to Squier guitars, and it didn't even have an option to search for neck profiles.
I really just don't understand why they have so few guitars with those necks and why the few that they have are extremely expensive. I just don't get why they don't offer people as many options, I think with every guitar they make they should make the same guitar with other necks, for the most part almost every guitar I look at has a"C."
Popularity. The average endo and exo hand isn't shaped for wider shouldered D necks, so understandably Fender tailors its production, sales & marketing to the predominent preference.
Gretsch make some D necks, but they are generally a shallow D. Very comfortable.
The time has passed when guitar manufacturers could get away with neck profiles which could double as an ersatz cricket bat.