For a game called Dungeons & Dragons, it sure seems like homebrew games (and even a lot of pre-written campaigns) skimp on both—which is something I'm guilty of myself.
Give me a rulebook for anything, and I'll find a way to plonk it in a city and have players doing political intrigue in a sea of proper nouns.
If I want them to actually go to an ancient ruin and slay a monster, I have to basically force my itching hand to avoid making any factions for my whole prep session.
It's a real problem. While dragons might be an iconic monster to hurl at your players, and there's certainly quite a few of them in the revamped Monster Manual, I've run my tables into dragons basically once in my decade of DMing experience.
Well, good news for us people who are bad at appreciating dragons—D&D's first post-revamp adventure set'll be about, uh, D&D.