Username or EmailPassword
It depends what the author meant by 'in the past'.
If you look back 10 (maybe 15 years), you would find that Unix was a popular development because of its stability. You definitely did not want to develop software under DOS, Windows 3.x, or even Windows 9x unless you were targetting those platforms because a critical bug would send the system into a nose-dive (either via crashing those OS, or leaving it in an unknown state that would make bugs hard to track). Of course that started changing with the introduction of Windows NT, but I don't think that developers started moving to Windows as a development platform en-masse until Windows 2000 or XP.
Linux on the desktop used to be stable. It no longer is. Most desktop Linux distros are buggy and less stable than Windows. That has been my experience with OpenSUSE, Fedora and Kubuntu. Its sad really. I think its because they've moved to a faster release cycle and try to pack in much more software so not everything gets fully tested.
My experience is the exact opposite. You will find plenty of people with anecdotal evidence supporting either side.