It was part of the nerf; instead of working like a Nova Bomb with SoDA, it's now better to dump the entire thing into one big enemy than a group.
It's -blam!-ing stupid. Make it like SoDA or don't make it at all.
The strange thing is that BB can be split up and directed both vertically and horizontally [i]ideally[/i] to hit multiple targets. Whereas the nova bomb can’t, yet it is favored for use on multiple targets and BB on one. Backwards!