Light groups for compositing
As I see that some render like ecycles and vray arnold gave ability to render every individual lights as output so we can modify them in compositing later . This heps in lots of cases where we need to change color or anything other in post compositing. Hope so blender will add this feature in next updates....
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This is known as Light passes and are available in Luxcore render engine for blender, it is available for free, try your hands on (Youtube "Dravia Studio luxcore" for tutorial). Will be happy if blender do such thing in Evee/cycles, but I don't think blender has time to do so due to Massive everything nodes project.
Different people work on different parts. I doubt the geometry nodes people ever do anything with cycles and eevee. I know I read somewhere that the improvements to cycles-x might make it easier/possible to add some light linking features and perhaps this feature also.... someday in the very distant future.
I need too :)