As I understand A/Dat optical can handle 8 channels at 48Khz 28bit.
I have never in all my systems of install come across a point where the cable would need to be bent too far. Although I don't think bending any cable too much is good for it, regardless if it works.
I know a lot of Alpines processors have Optical in. It's just so nice because you run ONE cable and have ZERO worries about interference. IF they are so worried about dumb people, maybe they could give us Balanced line outs (again). They wouldn't even have to invent a new connector. Just use 3.5mm Stereo Jacks as TRS connectors.