Macaroons are probably more interesting to people who don't already have a CapTP-like capability framework to build on. While you could express sturdy refs and

Macaroons are probably more interesting to people who don't already have a CapTP-like capability framework to build on. While you could express sturdy refs and live refs in terms of Macaroons, you can also express all sorts of things with less-than-ideal security properties too. There's a very nice conceptual purity to object capability systems like Cap'n Proto. That said, Sandstorm is doing some pretty impressive mappings of capabilities to web applications. Really interesting work!