[Avamander]

S/PDIF sucks all the asses out there due to terrible software support.

The source of the content you want to watch has to have support for it, the support has to actually work and it has to have a compatible audio track (or be able and willing to convert). Right now that means basically no streaming services or games, very select TVs actually output multichannel audio over S/PDIF.

(Gonna ignore the rare possibility that your sound card manufacturer has paid for the license to be able to transcode all audio)