You are speaking of 165 fuel tank that has same pen with Cromwell. Off the topic, but Churchill is nothing but a hp-pig with too much pop cap that it's hardly usable.
Penetration is irrelevant for Brumbarr since it has a slow projectile that will 9/10 miss the moving tanks. Off topic again, but Churchill is still a gimmick unit that is 165 fuel and forces a Panther to be able to deal with it since everything else just bounces off even from its rear.
And does too well. Thought that was the point is it not?
It bounces 2/3 of the shots from the Cromwell & 2/5 from the 6-pounder once it gets that + armor.
With properly used(ground attack), single shot can make full-hp inf. force retreat. and 2~3 shot we see potential wipe here. No stock tank can do such thing other than Brumbarr.
It's not hard to see OST going straight to the Brumbarr with 2 at ready even in pro-level plays (recent 2v2 tournaments).
It
should do too well. Unit is literally a specialist. Its cost and timing are also at the end of the spectrum. You are paying 150 fuel
only to fight infantry. It is the Obersoldaten of the tanks. Has one and only one job, and it should do it too well with that cost. Any nerfs to current Brumbarrs combat performance and OST late game is certainly hammered since the unit is just so much of a reliance considering OST is designed around somewhat weak infantry that can not go toe to toe with late game allied infantry and Brum just addresses that.
Edit: However, I can agree on something like a scatter nerf on the bunker busting barrage which is way too accurate IMO.