When you realize what E=mc^2 was really saying.

E=mc^2 is the traditional version of the famous equation.

But we know

E=hf,

Because energy is really just frequency so

hf=mc^2

But h is really

h=(s_length * s_mass)/c

in my frame work so

(s_length * s_mass * f) / c = mc^2

so

f= mc^3/ (s_length * s_mass)

Not quite as pretty, but shows the extra 1/c that was in the formula all along, and the human measurement scaling factors that always existed in the formula too. Mass is a 3 dimensional thing, not 2D.