Very true. I'm sure it's a very good soundcard, but it's still a soundcard. Not only that, but the STX is like 2.5 times the cost of the USB add-on for the Bifrost, so the USB option would be much cheaper in the long run. Are you sure your computer doesn't have an optical Toslink output? Then you wouldn't need either.
So if I have a Toslink connection which I do. Does that eliminate me from having to get a Bifrost or? I'm just slightly confused by "Then you wouldn't need either".