ph0rk
Friendship is Magic, and Magic is Heresy.
I would too, doing otherwise is one of the problems with 5e has when it comes to magic where too often anyplace it could really shine needs to be walled off or designed against.
Well, if that's open then twinning GFB is open and then (in the old days) a sorcerer could have twinned and then quickened three GFBs to melt a pair of targets.
I think removing the ability to twin BB (and GFB) is the main reason for this wording, also making them not work with shadow blade.