<font color='#000000'>I am not convinced that optical cable is worse than coax.
Its the same digital data traveling down the medium.
The problem is that neither of the methods carry a clock signal, as I understand it, so that clock drift can become an issue.
The failure of some optical connect systems is, for reasons beyond me or you, they use cheap optical connector ends on the hardware and possibly cable, which aggrivates this situation.
However, technologically, there is no reason optical would be worse than coax, if the proper components are used in the connection from equipment a to equipment b.</font>