I strongly support you view, without participating in war, a large army like PLA becomes inactive. Military drills don't help much. An army needs coordinating skills between various wings. For example attacking a strong enemy position in a coordinated ferocious manner is something that neither training nor drill can teach. Killing an enemy in a ruthless ferocious manner cannot also be learnt from drills where there is no bloodshed. US marines are experienced with such bloodshed and thats why its easy for them to mercilessly destroy enemies. Also US marines know how to attack enemies and eliminate them within a limited time or how to survive unexpected sudden enemy attacks. If PLA does not take part in real pitched battles, then one day PLA will become a waxed army. High techs don't give you the bravery that you can learn from real battles. A soldier must always be ready to achieve martyrdom and that makes some one a soldier. A soldier's main aim is to kill the enemy at any cost. Thats his primary duty. Also a real battle will let PLA know whether there is any flaw in their equipments and also new strategies.