Nothing in war is less than a tremendous waste of resources... And the benefit would be that all of the Russian citizens would have a chance to have a private laugh at Putin's expense. Most older Russians have no toys and are to some degree, jealous of Putin's toys.
Most Russian citizens will either don't care or be insulted that their Tzar is humiliated. But let's say you are right. How can private laughs help Ukraine to win the war? How can it change Russia for the better?
Changing Russia and winning the war are different things. I'm going to answer about "winning the war" and leave "changing Russia" for others to contemplate.
Ukraine is never going to win using brute force because there is too much meat to fit in the meat-grinder. They need a political win from other methods, and keeping the Russian public from having any interest in fighting is important for that political win.
So, what would the Russian news media and the Russian citizens say for each of these scenarios?
A) Ukraine drone-bombs a weapons factory near a city but collateral damage kills some citizens.
B) Ukraine drone-bombs one of Putin's palaces and wrecks a bunch of stuff, then releases the videos into the Russian media space.
I'm not saying it should be a focus, but there are already people trying to determine if killing Putin is an option, which means they are already looking at the locations where he might be and how best to attack them.