I can't help but feel you are contradicting yourself here. First you say you don't think Falcon needs any major changes. Then you reject this proposed change because it doesn't change enough? I think this small change is something Falcon really needs to diversify his movepool and give him better options in certain situations if not to just get rid of glaringly bad move. I agree that Falcon doesn't need much because his Melee set is very powerful, and so far this proposal does not touch his Melee moveset AT ALL while adding some small benefits.But why wouldn't you just SH aerial cross up OoS instead? Or grab? It's also stationary, so if they see it coming, or if they're just spacing well or shielding, you miss and get ****ed. On top of that, this isn't what Falcon needs. I don't think Falcon needs much really, and I think this is crossing too far to the other side of balance to "something is non optimal. we should replace it with something else, not because it helps the characters problems, but because it would be nice in some situations". Too much focus on things that Falcon isn't intrinsically bad at.
I also can't help but disagree with your logic in character design. What you have been saying recently has basically in my opinion been to give falcon the bare minimums. Literally, just take away all his ground moves he doesn't need them. Why did PM even bother boosting his Falcon Kick/recovery, he doesn't need them. Falcon is a really one dimensional character even with the little buffs he currently has and your way of thinking isn't helping that. An equivalent statement would be to literally delete Fox's entire moveset bar his Nair, his shine, and his UpB recovery because I mean those 3 moves cover everything a character would ever need right? In actuality that would probably also be the case for many characters. We could literally take away all but 3-4 of their moves and they would cover most if not all options, just not optimally. Now, why is it that PM does not do that? Because it's bad character design, because the characters would be very 1 dimensional and boring. Just because a character has a set of very viable moves does not justify that character having a set of dead moves along with it. Your faith in falcon's current moveset to deal with every situation is not wrong but it certainly isn't without flaw. Not that many people complained about it in Melee because the community had to deal with what they had. But now that the community has a voice in designing these characters it would be wrong to just let it pass when other redesigned characters are coming out with rather beautiful movesets.