I tried using Linux as my primary desktop mostly out of curiosity because I'm wondering what my options are as Apple continues to focus its efforts on iOS (c.f., the Mac buyers guide which paints a pretty bleak picture of the current state of Apple desktops and portables: http://buyersguide.macrumors.com/#Mac) and hopes that Docker performance would be as close to native as possible without a VM/laggy shared folders in the way. Plus I had a spare PC laying around.

I didn't give it as long as the OP, but it just took way too much time fiddling to get to a stable, working place and even then things weren't as nice as on OS X with very little to no tweaking. HiDPI in particular is a mess, with support all over the place. OS X nails it. Plus there are some really great apps I use every day on OS X that there is no substitute for (Sketch, Tweetbot, Reeder, Alfred, and Photoshop come to mind.)

Even "little" things like font rendering is kind of a mess on Linux and really is a big deal if you are a developer staring at them all day or are a web developer and need to see what things look like with proper fonts installed.

I hope OS X sticks around for awhile or a worthy competitor appears. I'd think there is an opportunity for someone to create a great portable, a great desktop, and a great OS for both but I'm sure it pales in comparison to the tablet and mobile ecosystem.