a16z's Anish Acharya says companies like Cursor and Decagon prove moats don't need to be designed, they can be discovered: "There's two important ideas. One is something @thejessezhang from Decagon said, which I love, and that is moats are most often discovered, not designed." "It's really easy, and I've done this as a founder, to get in your own head about needing a business plan that survives scrutiny from MBAs and VCs... And for that team, they just started shipping and it developed over…