i wasn't being sarcastic, and what you posted proves nothing.
It's the ability of one very specific character type. The Biju are the only ones doing it; the story has hardly devolved into DBZ territory... that's a ridiculous thing to think. It's like saying the Series has turned turned into just a whole bunch of summons spamming during the Pain arch, or that the series turned into just a whole bunch of sharingan spamming during the Sasuke/Itachi arch.
The series never even came close to becoming entirely about beast bombs, it just happens to be the ability of the character the story is focusing on atm.
lol, Edo Tensei has been used waaaaay more than Beast bombs.