Agreed. If anything, the technologically interesting parts compare better to the titanium submarine example, as the RD-170 engine that powered the Energia rocket that lifted the Buran was at least in some ways more sophisticated than anything Americans had at the time, and in particular, used an oxygen-rich staged combustion fuel cycle that American engineers had considered but dismissed as being impossible. Aerojet engineers didn't actually believe the Russians had even built such an engine until they were able to examine one in person after the end of the Cold War.