I think the pyramid is mostly going to be used for the 40%.
Its usually not worth working. Great for the initial pantheon. Possibly on flood plains with lady of reeds n marshes. And that's the synergy right there. Plop a pyramid, build a holy site fast, run prayers, get pantheon (and religion if incluned).
These aren't something you plan around other than one next to the city center, unlike Persia's ui.
But, don't they upgrade with techs? Do we know what they max out at if they do?
I guess they could be used as mini-petras, depending on the vc, if atop a hill.
It will be fun to fool around with them.
I'm running a huge kongo/egypt/nubia game thursday just for thst purpose. Maybe hotseat it.
edit: on marathon, their value increases in the early game by quite a bit. 1 point of of a bucket resource makes a huge difference through classical.
edit 2: I see the archers as great defenders. Upgrade yout slingers, get your promotions at 50%, then use them as +10 district defenders.
Maybe I'm starting to view Nubia as a more passive civ. Grab writing after archery, get your campuses up, then straight to apprenticeship. Should be getting scientists and engineers. Science victory ahoy!
edit 3: and I just gitta say, this is one damn sexy civ!