Perhaps the most important lesson for Putin is the realization that he cannot rely on the military’s assessments of its readiness, forcing him to take a more direct role in overseeing strategic operations. Ultimately, the combination of strategic lessons and a battle-hardened force will make Russia more lethal on future battlefields.
Nobody with a functioning brain thinks Russian army is beat to hell. Certainly not a single western military person is saying this. I guess I can see why you’d think this is the case if you’ve just been guzzling propaganda for the past two years uncritically though.