I agree, this is more like ww1, than ww2. I said that long time ago. It's telling how much Russian military power degraded, that in 2022-23, they are refighting battle of Verdun.
You are talking about ISR bubble, indeed, but where is the Russian ISR bubble? How come only Ukraine benefits from it? How is it possible that Russia slept over revolution in military affaires, last 40+ years, so that its military today fights a ww1?
Blitzkrieg isn't obsolete and can never be obsolete as a concept, but when you have obsolete equipment, with bad leaders (from lowliest seargent to Putin himself), badly trained and supported, where nobody dares to tell the truth (an example of that we can see on this forum), with corruption that eats into a living flesh of the country- then you have problems like Russia has today. Simply, state of Russian military is just a symptom of a state of Russia today.