Generally it's this.
Along with the fact certain parts of the fandom will scream Bumblebee is being added for political reasons versus "hey she was a member of this team before Wolfman, Perez and Wein showed up".
Dc should easily get a good 18-25 issues out of this back in the old days. Now with folks LOOKING for reasons to not support versus just trying the book instead of wasting money on yet another Batman worshiping event with a writer most don't like.
We keep screaming we want better but act like we can't break old habits.