If Not the Mac, What?

Back in the dark ages (the 1990s), I was an inveterate operating system switcher. At various points, I ran DR-DOS with DESQView&#x2F;X (what Windows 3.1 should have been), FreeBSD, several distributions of Linux, Windows 2000, QNX Photon, and BeOS. With the exception of QNX, I didn’t just run them, I used them. Used BeOS? Full-time? For more than a year, very productively—but that’s another…