is it or isn't it?
The expand of Chinese military is not aimed the same as the goal they used to have, the expand comes with a break through in mind. However, the PLA have 0 experience on fighting an aggressive warfare with modern weaponry. The same goes with Vietnam and much about most country in Asia region.
If you had studied Military Strategy and Tactics. There are no much strategy or tactics one can use to start an offensive, which mean you are actively engaging another military. The reason why this happened simply because when you are attacking, you are actually at the weakest when you attack, and any wrong move would create a major military blunder and usually resulting in a military disaster.
The key for PLA is to understand the stuff they are getting, which is both a brand new item and a brand new concept to them, while PLA need to build a weapon doctrine around the new weapon. The current level as far as I can see is Chinese simply adopt other countries doctrine and tactics, mostly because Chinese themselves have been copying other military equipment without a basic understanding of what they are for. Now I am not saying these copying won't work, but one need to know, who know better than the equipment you copy from? Do you really think Chinese will know better than the country that equipment they copy from? Which some member here seems to think so...
For example, Chinese operate on a US Fleet Model when Chinese mold over their own Carrier Battle Group. From the standard compliment to standard operating procedure. However, US derived those model is for US Navy, which for all intents and purposes serve US interest and not Chinese interest. It operate on US water with US operation, not according to the need of Chinese Operation. Hence when time comes there is a different between US and China about a single mission, the doctrine may not be useful, even harmful to Chinese military.
Instead of Producing Advance weaponry in a massive rate, China should stop and think how to use them to their advantage, which I illustrate by raising this question, What type of Military Doctrine Chinese invented since their formation in 1949? You have German with blitzkrieg, aerial combat warfare, Russian with Massive man power, anti-0submarine warfare, US with advance technological and communication warfare, intelligence warfare and carrier warfare Vietnam wrote the book on asymmetrical warfare, French wrote the book on cavalry charge, British wrote the naval doctrine. And as far as I can see, Chinese wrote none of those. And this is what they should do, otherwise the Chinese would always be adapting how other's fight, and I can tell you this, this is not good on a military point of view
All these tactics you mentioned like blitzkreig , etc are war doctrines that are known to Chinese. The art of war as written by Sun Tzu. Instead of using chariots, tanks and light infantry have replaced these, but the tactics remain the same. Human psychology remains the same.
I'm sure the Chinese military leaders know a lot more about military doctrine than anyone of us on these forums. It doesn't matter what any of us think, China is seeking to develop the most advance weapons regardless on our feelings and rightfully so. China has hostile enemies from the south and East. US has no enemies on their borders.