Originally Posted by
J. D. Guy
Perhaps a part of it is me simply not being around when Sam being Falcon was a thing in the comics (or being around other characters at the time and not Sam, etc.), but I would very much feel that Sam going back to Falcon would be a step backwards, not only mantle-wise, perceived or otherwise, but in general development. Not only would I feel that it'd be poor for Sam as a character, but it would also look poor on Marvel, too, that they can't have two concurrent Captain Americas, or more implicitly and cynically on my part, that they can't have a black Captain America.
On top of that, Joaquin Torres is now The Falcon. A lot of people may not realize this, especially people who don't follow this book and/or don't follow it closely. Sam going back to being Falcon simply to do so, for whichever reason used or created, would directly step on Joaquin's toes in a way that Sam being Captain America does not step on Steve's.
This is just speculation on my part, but in addition to Joaquin being introduced and made to be Sam's partner so as to have Sam's character come full circle (which I think is simple fact, in this case), I also feel that Joaquin being made to be the new Falcon was done as an underlined way of saying that Sam is staying Captain America and isn't going back to being Falcon. With that said, of course, I very much could be wrong, and even if I were right, that wouldn't necessarily stop another writer from making Sam Falcon again and either limbo-ing or out-right bridging Joaquin, but still.
Also, he can still be, and still is currently in this very book, a character driven by social aspects, while still being and remaining Captain America anyway.