if you experiment, it works a little better against some aerial moves than others.
The hitbox on uptilt, at least to me, appears come a little lower diagonally than upsmash. Like, upsmash gets to 1:30, but uptilt gets to 2 o'clock. So i use it those times.
I use it a lot in situations where i feel that there are different things my opponent might do, and depending on what they do they will probably get hit by the front, top, or back hitbox of the move. It takes a lot of experience/ knowledge of opponent's playstyle to find these situations, but they are there.
Remember, as counterintuitive as it seems to use the back hitbox of this move, that's actually the best part, in terms of after lag. So the back hitbox actually has the best "safe move" rating, if you've read St. Viers guide/musings to safe moves.