Anyone develop OSX apps? Or do you only need a Mac for your IOS dev?

macOS apps are written in Xcode as well. If that was your question.

@asdf No, I mean who (here) actively develops for OSX?

I only use it for developing offline iOS apps as I am a Windows dev at work.

I've considered making OSX applications from time to time, but I always find reasons not too. Either the UI desktop application is better served in Windows to make my colleagues and my day-to-day job easier, or I can make a web application that serves both platforms.

In the end, it is about use cases and the number of potential users.