Nobody is disputing the equation. But you’re ignoring the ‘C2’ portion of it, to suit your idea.Martin Hash wrote:If E=MC2 (there's some current debate on the issue) then photons have some infinitesimal mass. There's nothing about their speed that prevents this except in the equations that humans made up. And we know that mass affects light...
Energy != Photons, though they are a form of energy. You can convert energy into mass, which is what happened during the Big Bang, or you can convert mass into energy with a similar amount of energy.
Those conditions are not likely to repeat, and do not denote some property of particular kinds of mass and energy.