A B-52 actually works and does what it was designed to do.
That’s correct
The B-52 is no longer used for its original mission, and is worthless over contested skies. Its new mission is as a truck or delivery vehicle for standoff weapons. The virtue of these improvised armored vehicles is that they might be cheaper than a Javelin missile. More like upgunned decoys than actual tactical threats. They cost more to shoot than to build. They may not even have any ammunition. (How much ammunition do you think there is for 80-year old naval guns?)
A T-90 costs several million dollars a copy, a T-72 or T-80 is much more costly than a Javelin. I think the Russians are going to tow these within range of Javelin gunners and get the hell away, and hope for the best. I would not be surprised if the Ukrainians just wheel up a 155mm cannon and punch them with direct fire, acting under the assumption that they pose no threat of return fire. You would not want to get too close to one of them, but they are probably of little real tactical use.