[biglyburrito]

Only Linux is a dealbreaker for me, simply because I've never worked with it & most of the GUIs I use aren't built to support it. I've worked on both macOS and Windows over the past decade-plus... I'm less familiar with macOS, but I'm more at ease using it with each new job.

Supporting multiple OSes means extra complexity & work for MIS, IT, and DevOps departments. Also, there are sometimes issues that crop up due to OS-specific work (e.g. newline characters) or tools that are only supported on certain OSes. So I understand why some companies are more prescriptive about which OSes they are allowed to use.