Yeah, this is a point a lot of people simply don't understand. Having billions of dollars in GDP generated by the service industry (like financial services or informational technologies) does not map one to one to generating a functioning arms industry to produce artillery ammunition for example. You need manufacturing facilities, a large pool of candidates with potential expertise in technical hardware skills to run these factories and logistical lines to keep them running. These prerequisites existed in the West during the earlier part of the 20th century which was why the transition to the war economy was relatively painless but no longer exists now. It is simply irrelevant to talk about multibillion dollar GDP economies specialized in unrelated industries if you don't have the actual physical resource and staffing requirements.