First, I wish there was a resource but there isn't. This kind of just lives on as bits of folklore among users and devs. You'd think Apple's guidelines was a pl

First, I wish there was a resource but there isn't. This kind of just lives on as bits of folklore among users and devs. You'd think Apple's guidelines was a place to start, but honestly not really. The sibling comments gave some great answers and especially `crazygringo` summarized pretty much exactly what I was gonna say, so I'm not gonna go into detail. But I just wanna add: "Mac-assedness" totally includes of some strict, non-negotiable rules, but it also involves lots of loose, abstract "vibes" where even if your app isn't exactly guideline on paper, it just feels right in spirit and paradoxically, by being more custom, the app comes out more native in the end. This takes a certain personal taste to pull off as a developer. And it is the opposite of design by committee.