light speed isn't really all that good when you remember that information in your electrical circuit is traveling as fast (if not faster) than light in the medium in this case. Sounds good in marketing, but the key here is bandwidth, not 'speed'
Is it correct then to say that augmenting the other properties of light increases overall information density/capacity of light as a medium? whereas with electricity we only have 2D: amplitude & freq?
the actual optical "packet" of information is traveling slower than the electric "packet". The key here is that the electric packet can a few bits, while the photonic packet in theory has a much larger bandwidth.