Half of what you typed is false, watch some hans streams with him microing both units, he pretty much uses attack ground every time due to how unreliable they both are vs moving squads.
Every thing in that post is accurate. Your response on the other hand is full of inaccuracies as other users have pointed out. Can you pls tone down the hostility in your post a bit?
Brumbar also has pretty much identical range with bunkerbuster so nerfing the ISU when nondoc brumbar stays the same would be crazy.
Brumbar is actually viable in 1vs1 too, ISU is only really useful in team games that have open lane areas. Brum projectile can shoot over shot blockers but in true vipper fashion you conveniently ignore the perks of the axis units.
Let me explain this once more, comparing ISU-152 and Brumbar is totally misleading for a number of reasons including the one I have already mentioned.
On top of that units work differently.
Brumbar needs to be aggressive to auto-fire while it is facing allied TD that can penetrate it reliably while outrangeing it by double its range.
ISU-152 can sit back and snipe units because the are few units that outrange it and even those by small margin and need spotter to do so.
Regardless if Brumabar has better AI or not ISU-152 has much better AT.