The major issue with Linux only development is the lack of proprietary software. Photoshop, for instance. There is also some great Mac-only software, meaning a

The major issue with Linux only development is the lack of proprietary software. Photoshop, for instance. There is also some great Mac-only software, meaning a Mac runs the widest variety of software of any OS - since you can run Linux, Windows and more in VMs. Finally, Mac provides a much nicer UI experience than any Linux so far. That won't change for the foreseeable future given the grab bag of UI technologies Linux apps use.