FET is actually a lot simpler, and doesn't rely on made up forces and particles to work. Occam's Razor supports FET, not RET.
Some made up forces and particles from FET, without which it will not work:
Aether, denpressure, bendy light, Tom Bishop's magic intelligent photons, whatever force it is that holds the sun and moon up, the universal accelerator, moonshramps, the sky mirror, atmoplanic lensing, a huge conspiracy, the ice wall, celestial gears, and many more.
And is there any falsifiable observational or experimental evidence for a single one of these? No. Not a single one.
But what particles and forces does the "less simple" RET require to produce the effects observed by all the above? Prepare for a long list....
Light and gravity.
Who needs Occam's Razor when you have Vauxhall's Dustpan & Brush?