There are lots of amazing Mac only apps, but I'm not sure simply running them on Linux would be worth it. Without the cohesiveness of the UI as a whole you'd be losing a lot.

For me it’s mostly media apps - Fireworks CS 6, Reason 10, maybe some version of Garage Band. There’s alternatives but these apps hit a sweet spot that I could camp out on for decades if the tech treadmill didn’t like to make software an exercise in seeing shifting shapes in the clouds.

> Is there some really amazing Mac only software that would justify the effort ?

As others said, the killer app is XCode. Even if you can technically get it to run, you'll still need the full support and test flows of a native solution, so you might as well follow the proper path and use a Mac.

I can get Visual Studio to run in Parallels today. I still test with a real Windows machine.

Glyphs is like the only game in town for font editing. I’m an Omnigraffle enjoyer too.

it's really not, I see my colleague using https://www.fontlab.com for professional font authoring. I'll ask them about glyphs, got me curious.

Most of the apps on macos are for fixing os behaviors that make no sense.