A lot of my favorite works have worlds that feel like you're barely getting a glimpse of them. The author has something much bigger than you'll get to see, and it makes the worlds feel alive.
That said, I've dropped a lot of books because there's some sort of explanation of the world. By the time I care enough about a world enough to sit through an explanation I no longer need one.
If your work does well people may clamor for all this extra stuff you made. Maybe then you can publish it. But even then I'd be very cautious. Star Wars was partially killed by explanation. If something that beloved can't bear explanation, that's something to keep in mind.