There are few things wrong with BSF and one of them is that she does not have dark side bone in her body and yet now she will become part of Sith meta.
It was too soon and it might backfire for future earnings as I don't see why would anybody ever again spend large chunk of money on future characters.
Issue of Sith Trio was never addressed. When Nihilus came out he was OPed and still is. When Sion came out he was OPed and still is. When Treya came out she was OPed and still is.
Instead of helping them stay meta there should be "normalized" so that other teams have chance. Only way I can think about their unwillingness to address this issue is that one of the developers plays Traya team in arena and is unwilling to adapt in his/her own game.
Also I would like to point that Revan brought lots of weird teams (NS, BH, Scoundrels, CLS, JTR even Ewoks) in top 100 of arena and now all those teams will sooner or later be pushed out of even top 200.
On different note why are people still running Thrawn in their teams as it seems to me that Palpatine (or even Vader) would be better option even if he is not in a leader position?