Why did the PLAN focus on surface ships rather than submarines before the 2010s?
Short answerBecause China's dependence on global trade created an early and growing need for visible presence and sea-lane protection, while submarine development was less public.
NotesChina's trade creates a requirement for maritime presence extending back before the 2010s. The examples include oil and liquefied natural gas from the Middle East, worldwide container routes, and raw materials from Africa. Protecting those connections provides a reason to build forces able to operate beyond nearby waters. The comparison also cautions that visible fleet growth can be the delayed result of work begun many years earlier. Submarine programmes attract less publicity, so prominence of surface ships alone cannot establish the relative effort devoted to each.