For stereo, TOSLINK is fine. But so is the copper port right next to it. I removed it because it's basically unused fluff for more than 99.9% of all users. I used that port (on a dedicated sound card) once to connect a DTS 5.1 active speaker system (marketed at gamers like me) back in the 00s. It doesn't really have enough bandwidth for 5.1. But I'm no audiophile, so it was fine. Thing is: Just plugging in the copper cables works as well and provides the full bandwidth.\

And motherboard-integrated DACs are pretty good now. Even audiophiles can't hear the improvement in stereo in blind tests (they probably can hear copper sounding better in 5.1 though).
It's basically the Betamax of audio connection standards. Technically better, but market adoption is negligible.