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.
Like the Russian Baltic fleet has been battle-hardened by its contact with the ocean floor.
Ah yes, Russian Baltic fleet was famously destroyed in the imaginary universe that you inhabit.