why dont more falcons use back air from the ledge ?

[ramz zeus]

so i was testing some things and i found out if you let go of the stage on frame 8 jump, back air 1 frame after jumping next frame start drifting towards stage and fastfall on frame 18 the bair autocancells and you can shield while being fully invincible and if the bair connects you can get a reverse bair to knee or grab to edge guard to kill i was just wandering why more falcons dont use this

 

[BauxFalcon]

It's easy to avoid, and it doesn't reach as far in as nair, knee, or uair.

 

[Spak]

In addition to what Baux said, Bair comes out on frame 10 vs Uair coming out on frame 6 and Nair coming out on frame 7, so people don't usually go for a move that doesn't go out as far and doesn't come out as fast as another viable option from ledge. The only usefulness I could think of for Bair from ledge is if you did a Dokorai wall jump -> DJ Bair or read them unsafely approaching ledge super hard to get a reverse Bair, but the first one isn't practical to set up and if you get that hard of a read on an unsafe approach while you're on ledge, you may as well just go for stomp on stage. You'll get more off of a stomp than a reverse Bair.