> My first exposure to Solaris was in 2003 when Linux had Gnome 2.6 and Solaris had CDE. The UI on my Debian box seemed decades ahead of the Solaris machines I managed, which looked like Windows 3.1 and performed about as well.

Linux having better UI than proprietary Unices (except SGI) was true from the beginning. In 01993, even before package managers, the Linux standard was color rxvt, color ls, Seyon, fvwm with multiple virtual desktops (really important at 800×600), Emacs preinstalled, and you could termify your web browser and whatnot so you could run them at home on a dialup shell account. Proprietary Unices (except SGI) had monochrome xterm, vi (with no arrow key support), and typically either twm or mwm, which both looked like shit and still do. Suns sometimes had olwm but Sun had sort of abandoned Open Look by that point. If you had a Sun at home connected through a dialup shell account, you could forget about running any TCP/IP apps on your Sun. By 01996 the Linux world had slirp, so you didn't even have to termify your TCP/IP apps, while Solaris didn't even include a C compiler anymore.

CDE seems like somebody thought that the problem with Motif was that, although it was butt-ugly, it wasn't quite ugly enough.

And, yeah, backspace worked. Also automatic window resizing. And for years Solaris had a totally fatal TCP round-trip estimation bug which made TCP connections to Solaris machines over dialup incredibly slow. Linux was just dramatically more technically competent.

Sun did have a pretty amazing engineering culture. They shipped SPARC, Open Look, NeWS, Java, HotJava, HotSpot, NFS, Sun RPC, yp/NIS, Spring, ZFS, OpenBoot/Open Firmware, and I think even Sprite, and for a while they employed the Tcl team, bringing Tcl out of the stone age. But they sucked at fixing the fatal flaws in their actual products, and half the engineering achievements in my list above were murdered by Sun's incompetent management.