tomscharbach Microsoft requires 16-bit for Windows Compatibility Mode and won't certify the card unless 16-bit is supported
After I found that out, it occurred to me that perhaps gaming could be another reason 16-bit color is still supported. For those paying a lot to get the last shred of video performance out of a computer, I imagine it's possible that using a 16-bit color depth would be an advantage. And it would still provide sufficient resolution to play a game.
After this recent adventure, I decided to revisit my exploration of the KED Plasma version of PCLinuxOS. I've replaced the Darkstar .ISO file with the Plasma .ISO file in the VM's virtual CD drive, and installed without any problems. It's now about to the middle of 555 software upgrades. It'll be interesting to explore its current state.