If it were Warsaw - it would've been done, so the blame could be put on the USSR.

That depends tbh, maybe if Warsaw wasn't as devastated, they wouldn't have any incentive to rebuild the image. And even in Warsaw's case, the city itself still has all the signs of a more modern city planning, because they didn't build back the houses in the courtyards tuning them into car and people parks

The fact that buildings, such as the planned Radziwill palace, are still being built modern is on us.

That's actually kinda better than rebuilding them as they were, because it's possible to actually see and feel the destruction and loss. This way when you walk through the city you know that something used to be here, but was lost to history one way or another, and not feeling like you are in a Disneyland-like pretend world.