Thumper is more likely to be an event vehicle given it was kinda a more neach prototype testing some stuff regarding expanded 120mm and 140mm stuff. The CATTB on the otherhand was a vastly more developed system that had alot more potential for service however never made it thanks to budget cuts since the USSR went the way of the DoDo
Everything you said is true, but it still has the same weak spot as all other Abram’s, which is the drivers port. It would be hard to fight, yes, but still possible to kill quite easily.
tbh, funniest thing with the CATTB is that i can fully see it being added unable to penetrate the UFP of soviet MBT’s still resulting in US mains crying its the shittiest thing in the world
The armor penetration of the CATTB was somewhere around 700-800 mm at some angle. I gotta find the picture that showed its characteristics compared to other APFSDS rounds at that time period.