> Those are the ones who will read this and say “wow Firefox says this is how to make my app fast so I should do it!!1!” and what is going to happen is either they’re going to use it wrong, because they aren’t really experts on how locking works, or they’ll copy the code of of Firefox

You can't save people from themselves, but in any case this seems to overlook what I said at the end: "the majority of applications weren't even using lower level primitives like OSSpinLock in the first place, so replacing it was not a concern."

I wouldn't worry about native Mac developers, who I suspect are mostly a dying breed of grizzled old veterans nowadays. To illustrate, I noticed recently that the last post on https://www.reddit.com/r/macprogramming/ was over 2 years ago, April 2020.