Also, people differ in the "density" of cards they need around a given topic. I might need a lot of cards to cover a particular area of a topic in many different ways, while someone who already knows that area needs fewer.

I agree that public decks tend to be terrible. So I don't really know any good ones. For the examples in the post, I tried to keep the wording as close as possible to the flashcards in my own Mochi decks, without adding extraneous detail.