These "new realities of war" are flawed,
the only conclusion we can get is that when the 2 opposing sides are closely matched (in technology, resources, manpower, tactics, etc) it is very likely that the result will be a bloodbath and a slugfest
this was the case when the 2 sub-par, poorly trained, poorly led, corrupt, antiquate armies of Russia and Ukraine clashed
Very recently, Israel had no issues defeating well entrenched, drone armed, highly trained and highly skilled Hezbollah fighters in Lebanon
the US coalition had no problem kicking ass against battle hardened Iraquis in 91;
this was months after the end of Iran-Iraq war. And if someone tried to draw conclusions from that 8 year conflict was that offensives were costly, the battlefields static, trench warfare the norm, etc. The vast technology difference between the US and Iraq invalidated those arguments
A (conventional) war between Russia and Nato would look different