This can also be handy in the lipstick swatch videos on YouTube so that you know whose video you should follow the most to shop for yourself.
I know that various other factors need to be considered and a standard measure like that would never be 100% but it would make life so much easier for good.
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It would be great, but since some brands have like 60 different shades and some have ten, it would be hard to make a compromise on the amount of different shades, since all companies don't have the resources to make all the different shades.
For me it's pretty easy, because most of the time it's the lightest shade they have, but people who have a trickier skin color would definitely benefit from it.