Agreed because at the end of the day the destruction and mayhem being done in Ukraine is pretty much the same in the eyes to all the Ukrainian victims. And the same amount of financial destruction was going to be exacted by the west would be of similar nature as well. Only Putin knows and his inner circle as to why they went in the way they did.
One guess is that Russia isn't going into Ukraine purely for reasons of national security but because it actually is conquering for the old school reason of conquest: to gain national wealth and weakening the enemy.
Taking 1/5 of Ukrainian population and land is devastating for Ukraine to be sure but it is also a huge gain for Russia if the conquered regions don't rebel, and from what it looks like, they aren't rebelling. Ukraine by itself is 1/4 Russian population, 1/8 Russian GDP. Gaining 1/5 of that would mean Russia increasing 5% in population, 2% in base GDP, while weakening Ukraine by 20% in population and GDP.
Viewed in this context, going lighter near the frontier and heavy in the rear is expected: Russia wants the Donbass, Kherson, Kharkiv if possible, etc. as productive regions of Russia. They don't want a bombed out wasteland near them that they'd have to pay to rebuild and where the population has fled or is rebelling.
This is yet another way that Russia and China differ. China is already so productive within it's own borders that it doesn't need to conquer or loot. China already won its wars of conquest long ago against Xiongnu, Xianbei, Mongols, etc. This means that China doesn't need to care too much about enemy infrastructure or rebellions.