The war isn't over yet and celebrating the death of the defenders isn't good karma.
I do wonder if Zelensky pulled a Stalin who demoted and eventually eliminated (if my memory is correct) one of his best military leaders because he thought that due to his immense popularity that he posed a threat to his crown.
Before Zelensky replaced his general, Ukraine was at least maintaining a stalemate even as that general made it clear that Ukraine didn't just need more money and weapons, they required more manpower.
In a just world Russia would lose this war. Ultimately though, there aren't winners in war, especially long ones.