In the comics, Binary is the superhero identity of Carol Danvers in the ‘80s, when she was a close ally of the X-Men and had previously had her abilities as Ms. Marvel depowered—and was in fact her de facto identity for much of the ‘80s and ‘90s. Give or take, she still has had those cosmic abilities on top of her usual ones ever since she returned to the Ms., and eventually Captain, Marvel mantles.
Which means on film at least, we have now seen more universes where Maria Rambeau became Captain Marvel than we have ones where Carol Danvers is, between Binary and the Captain Marvel glimpsed in Doctor Strange in the Multiverse of Madness. Sure, in What If season one we did get one alternate world where Carol was still Captain Marvel, but it’s very interesting that on the big screen so far Maria has consistently filled the multiversal mantle more than Carol has. Simply a convenient way to keep Lashana Lynch around, or will there be more to it?