I found ST, when using a good ST-type cable - not the standard Siecor stuff, outperformed every coaxial or balanced cable I have ever heard, and the balanced cables had a consistent unmusical midband. The ST was faster and less dirty sounding with better extension top and bottom. Of course it all depends on how well the interfaces are implemented, and the ST worked just brilliantly on my Theta gear (now sold to another).
I work for a telco and the ST standard is quite old and has been superceded by different connectors and different standards (such as single mode where a narrower colour range is used). I suspect it is just too expensive to bring telco fibre standards down to the retail audio market when telco developments keep moving forward. For example all the action now is in DWDM where even higher bandwidth is obtained by using multiple colour ranges at the same time - bandwidths way beyond the requirements of audio.
I work for a telco and the ST standard is quite old and has been superceded by different connectors and different standards (such as single mode where a narrower colour range is used). I suspect it is just too expensive to bring telco fibre standards down to the retail audio market when telco developments keep moving forward. For example all the action now is in DWDM where even higher bandwidth is obtained by using multiple colour ranges at the same time - bandwidths way beyond the requirements of audio.