Don't know where this is coming from because in my experience developing for the web is much easier. There is tons of up to date documentation out there.
Whereas developing Mac apps seems to rely on a set of arcane knowledge and having been in the scene for years. The documentation for AppKit is vastly outdated and there is almost no blogging/tutorials scene so as a newbie you are basically going to be going through a lot of trial and error.
And then most of the documentation you will find is in ObjC while everyone around you is telling you to develop in Swift, but then Swift changes every few months. You open up a project from a few months ago, it doesn't compile anymore, and you basically have to work at Apple or be a dev god to fix it.