Agreed with Mikey to roll out what has been previously done, unless it is a big refinement. E.g. TR sidepods are just like F92A one's.
But EBD (re)introduced by RBR are different from what Renault did in the 80's because it didn't exit in the diffuser but outside, and off throttle EBD is a huge step too. So it worths to have a look at it.
And top teams must not be excluded. Otherwise, what about U-sidepods, mass dumper or F-Duct?