Well, I can see BRB being OP against Advent [Maybe Solonus Buff will help... Maybe...], but Vasari? Kostura. TEC? Ogorovs.
Hell, I remember this coming up with Wail. "Its OP", "No its not, you just need to scout and not let the enemy hold the planet that whole time, you're sacrificing a planet for this, so it had better be worth it!" and how it forced players to play a certain way, yet we were constantly told it was balanced.
I'm seeing the same sort of thing with BRB. You are potentially wasting a ton of resources to deal a lot of damage to the enemy fleet. Both cases can be solved by scouting and very careful fleet movement, though that's just not practical in a lot of games. Unless its been patched, last time I used the Red Button, Autocast had it activate the second the SB was attacked. So you can't auto-cast it, or else lose the SB to a tiny set of scout frigates.
If its not auto-cast, there is a small chance you could sneak past, but a far better idea would likely be to just jump in a few Ogorovs and attack the SB. They don't jump in a fleet, the SB possibly goes down without too much of a fight [Maybe send some percherons with fighters to be sure]. They do, then they risk sacrificing their fleet too if they activate the button.
In theory it could possibly be countered, but in practice will be where this matters. So, go out and test it. If it is OP, it will hopefully be nerfed next patch, or something buffed to counter it. If its not OP, then alls good. Must be tested vs other players in online matches however. Simply pointing out its strengths without doing so isn't very helpful.
