It’s probably me that was proposing the "Temple". I even made back in release day a mod that gives you the opportunity to test it.
I, and many others, compare often Incas with Aztec, and I totally feel like there is one building that is missing, and the Temple could fit that.
So far, just game design and not balance wise, Aztec is lacking “something” compared to the Incas. This is why I made a response on the first link.