First, thanks for this admission...these are
very helpful and necessary for an inteligent conversation to take place
2nd, it would not have been a poor example IF photons traveled from Point A to Point B 'instantly'
The real problem is simply this... the 'erronious' SR inherent Double Constant definitions of "c"
1. 186,282.397miles per second...which is obviously....time and distance
2. The 'Singularity' definition at the division by 0, of 0 time to ANY distance OR exactly equivilently, "Instantaneous" travel time to ANY distance OR the contraction of 'space' to 0/point (Supposedly 1d)
There cannot be 2 definitions for a "Constant"...period
Constant by definition means one thing always the same.
SO, you are kinda trying to do the right thing by saying there is only 1 of those that can be a 'Constant', and you, and the others you have quoted, are chosing "Instant travel time 0' and retaining the distance...because, and rightfully thinking that "0 distance", for things we most certainly know are at many different distances, makes NO sense what-so-ever.