So does the Usmash hit better on 2D stages (Duck Hunt, Flat Zone X, etc & omega versions)?
I'm not sure, but this only covered the animation. The first hit can knock people back too much and cause the second hit to whiff resulting in a 4% Smash attack. I think you can even DI it making the second hit whiff too.
Also, I think the hitboxes end earlier than the animation. Short and crouching characters won't get hit by it from the back and this might be the CPU air dodging, but I had them land on Falco and it missed completely - I'm leaning towards perfect dodging and maybe the they landed perfectly in between Falco's kicks.
On Battlefield, because the move barely touches over the platforms, it's either the first or second hit and most likely the first kick will hit unless, I guess, if you do a reverse Up Smash or something. So, this makes Utilt more useful if someone's on a platform. The first kick never killed Pit at center stage or around the stage and I doubt even with platforms and a high ceiling, that it would kill.
Long story short, unlike, I think it was Greninja's Side Smash, Falco's Up Smash not only has animation "issues", but also functionality/property issues. It's a fantastic move if it fully connects, but when it doesn't...
I understand not taking Brawl Wolf's Up Smash and just giving it to SSB4 Falco, but then there was Bair becoming Wolf's Bair and an image that had Falco in a similar pose to his Melee and Brawl Bair. That Bair being a sex kick would have made Falco's disadvantage less painful. It's weird to say the least.
I'm a bit confused. So does his up smash whiff because of how he positions himself? As for wolf i hope they keep his up smash. I thought it was cool.
Basically, yes. Smash has always been a 2.5D game. While I don't really know about past games except for SSB64 having primitive, but at the time, advanced hitboxes - literally, hitboxes -, SSB4 seems to make hitboxes more accurate to the animation resulting in things like the way Falco's Up Smash whiffing or Marth and Lucina's Shieldbreaker whiffing if you're too close because Falchion isn't hitting you. Look at Brawl and Ganondorf's Wizard's Foot. He turns before launching forward on the ground and during the turn, he's not hitting anything. It's only when he launches does he hit stuff.
With Falco's Up Smash, it's probably a combination of how he's kicking and maybe the hitboxes ending sooner than the animation. Fox and Yoshi cover the 2D with the kick - front, top, and part of their back. Adding the ".5D" or 3rd D since we don't play Smash in third person, they're covering their front, top, part of the back, but not really the sides which Link's Spin Attack would do. Falco's kicking diagonally. Theoretically, in 2D, he'd cover the front, top, and back too, but in 3D, he's covering part of the sides, part of the front, part of the back and the top. His Utilt also does this too, but less end lag and less knockback on the first hit makes it easier to link.
Does this make any sense? How about this. Take a circle or a can, like a can of cat food or something, and lay it flat on a table. That's how Fox and Yoshi's Up Smash work. Now, lift the circle up a bit and tilt it. That's how Falco's work. As for Wolf's you'd need 2 circles.
Edit: I should clarify that it whiffs mostly behind him rather than completely whiffing at any point during the move while the first hit can cause the second to whiff.