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I have heard suggestions that this is still in the build up phase and first they try to take cities directly if that doesn't work the circle them, cut them off and level them. And the giant convoy
is not stuck but that is just the speed they can move such a huge mass.
All the little positive signs are just because the news cycles are so quick and need constant updates and longer term it will be total destruction.
Defence experts are puzzled by how few Russian combat aircraft are flying over Ukraine. Russia hasn't even attempted to gain air superiority. Possible explanations being floated are:
https://rusi.org/explore-our-research/publications/commentary/mysterious-case-missing-russian-air-force
https://www.reuters.com/world/europe/what-happened-russias-air-force-us-officials-experts-stumped-2022-03-01/?utm_source=digg&utm_medium=email