Be honest: When was the last time you contemplated connecting an analog surround-sound speaker system to your PC?
The industry tried to make the process easier for us with wireless surround speakers, but even they gave up on the concept.
If you connect speakers to your PC at all, you’re most likely going to choose a 2.1-channel system, so all you really need is a stereo output (because the crossover for the sub will be in the speakers, not in the PC). And if you really want surround sound, buy speakers with an optical input.
Whack those unused audio ports!