First of all, amazing article!

However, I believe that the bit about light being a "continuous" signal in the first paragraph invites conflicting thoughts of wave / particle duality, which distracts from and is not at all relevant to your point.

The eye samples light because it connects to a machine with a fixed number of inputs. This setup would also require sampling if the signal were not continuous at all, but instead consisted of a much larger number of discrete parts than the "sensing" equipment could handle.