"simplified and correct"
Pi = 3.1416 == Simplified.
It is not RIGHT, yet it serves the purpose many give to it.
"Editing your post and changing a few words here and there should make it correct. Why don't you want to do it?"
Because once I start doing that, It'll become a an unstoppable rock rolling down the hill... Probably causing the dis-interest in the public I'm aiming to.
"You should explicitely..."
It is explicitly implied.
"You are free to do what you want. Photons are not the only massless elementary particles. Why don;t you want to remove the 'only'?"
You're right about that... I'll change the word for is one of (also covering the possibility that another particle other than the Gluon is found).
"You cannot deduce c from other fundamental constants, which is what you quote."
Sadly. I am forced to: simplification.
"Spacetime exists for all particles, including photon."
Yes, yet the photon does not "experience" it... " if we could see from the photon's point of view: In an nonexistent instant, we'd be at the star"