As soon as green was introduced in ROTJ, all other colors should have been up for grabs. It’s actually super irritating to me that all the Jedi in the prequels have blue and green…and then there’s Sam Jackson with his purple glow stick, but no yellows, oranges, whites, or different shades of blue, green, or purple anywhere to be seen.
At least TCW somewhat rectified this by giving Ahsoka a yellow-green one when she upgraded to dual-wielding, and the Temple guards got yellow ones. And then there’s the Darksaber, and Rebels gave Ahsoka white ones.
Still hoping for Rey to get a yellow one in VIII or IX.
I actually hate the RGB lightsaber colour scheme myself. Still, in a trilogy where a limited palette was already established, I would’ve hated to have seen a nobody character played by the worst lightsaber choreographer get his own unique lightsaber colour when more important characters never did.
And I’d personally like to see Rey get a teal or orange lightsaber, myself.