You're missing the point. Russia simply lacks the conventional missile production capacity necessary to flatten Kyiv. They used up most of their missile reserves early in the war and are now firing them off about as fast as they can build new ones. And it's not clear that they're able to accurately target individual buildings; some of those strikes appear to be random collateral damage. Russia is simply no longer capable of large-scale precision manufacturing; it's a relatively poor country with a broken tertiary education system and most of the foreign experts left years ago.
I think you underestimate Russia. The current state of the war is still in a gentlemen state. There are so many escalation steps left. From using chemical weapons to empty Odessa to closing the black Sea to let Belarus enter the war to destroy water systems to use bioweapons in all border area to mass invasion to destruction of all Dnjepr bridges to assissination of government personel to destruction of government buildings to sinking of western oil carriers to dropping nuclear bombs on London or Berlin . Really the current war is nothing yet
> it's a relatively poor country with a broken tertiary education system and most of the foreign experts left years ago.
I’ve read that the local brain drain has been challenging too, eg https://www.npr.org/2023/05/31/1176769042/russia-economy-bra...