> Attributes that distinguish WW3 from previous world wars were IIRC

You're missing the commonalities, what defined world wars: the full might of industrial economies being dedicated to military campaigns.

World War II's theatres' were incoherent–the Axis interests in e.g. China and the Pacific had basically zero stragegic overlap with Europe and North Africa. (The only parties having to consider a unified theatre being the USSR and USA.) But the entire economic surplus of Europe, Asia and North America was basically dedicated to (or extracted towards) making things that were reasonably expected to be destroyed within the year.