I guess you already read that part but for everyone else: yes, lets embrace os diversity.

I'm not against Macs. On fact I say: if possible give Macs to everyone at work who prefers them.

Linux is not perfect. My current Ubuntu has been particularly bad. (But that might be my fault as I got to the current state through unofficial states.)

I even grew an appreciation for Microsoft, partly because they changed a lot and partly because I learned a lot (about ABI stability, large scale software engineering, importance of documentation etc etc)

So lets advertise our OS-es but lets not pretend Mac or Linux is best. Not mentioning Windows here since they haven't annoyed me for a while : )