In my opinion the Russian military was woefully underprepared for a military operation of such scale; there simply wasn't sufficient logistical and intelligence preparation in advance. I'm willling to believe that even the high echleons of Russian were only given a few month's notice at most. The actual battleplan was sound, but appeared to be based off a contingency plan drafted shortly after 2014 that vastly underestimated Ukrainian resistance. And even that was not carried out with sufficient force due to lack of preparation. I'm willing to believe that Kremlin carried out the operation irregardless simply because the window of opportunity was closing quickly.Putin clearly overestimated the capabilities of Russian military, thinking they are still like Soviets in their prime. People can cope all they want that "ackshually Putin planned to fight many years in Ukraine from the start" but that was clearly not the case in the early days of war where Russia tried to quickly get to Kiev. Only after they retreated from there, did it transform to the current slugfest we're seeing.
There is even a recent interview with Prigozhin who says that Wagner alone lost 20k+ people and branded both the retreat from Kiev & loss of Kherson as failures. He also said that the demilitarization of Ukraine has failed and gave the reverse effect. If everything is going according to the plan, then there is no reason for him to lash out like this at Shoigu and the war itself.
So the copium needs to get stopped and the situation at hand should be dealt with. The incoming months will be crucial - Russia cannot continue giving up positions like they did in Kherson and needs to stop the whole counter-offensive thing dead in tracks. If they succeed, then I think it might open up the possibility to again gain the momentum back and not only consolidate the current position but also push westward to create more buffer zones.
I think Putin was correct from a strategic perspective. Western economies were pummelled by COVID-19, but not yet crippled. Biden, an ardent Atlanticist with a government that was extremely hostile to Russia, was coming to power in the US. Once the West recovered sufficiently from the slump Russia will be chocked further by NATO with no chance of fighting back. It might be his last chance to reverse the increasingly tight stranglehold on Russia and dismantle the existing order. And judging from the economic havoc the war has caused on the West, it appears that Putin was correct after all. As for the Russian military, it simply wasn't Putin's field of expertise.