I'm really wondering why China still pushes for submachine guns in military usage rather than carbines. Even in some of the recent photos with troops decked out in new xingkong gear some still had smg's with suppressors. I'm wondering if it's just old doctrine that has yet to be updated since I think that type of squad set up is from the Sino-Vietnam war. Police I can understand since lower recoil and less penetration can be ideal especially in a country where firearm and body armor ownership is rare.
They seem to have both. Well generally the SMG is considered obsolete. It still has a couple of aspects that are advantageous. As the recent US Army Subcompact weapon program showed, major military are still interested in the class not just China. First is compactness a 9mm caliber SMG vs even an equivalent barrel length Assault rifle carbine will always be smaller. This is a plus as a PDW or for personal security detachments. In suppressed a Pistol caliber generally takes better as the ammunition isn’t as likely to be super sonic. For Urban well some Rifle ammunition may not penetrate military are restricted to FMJ which generally will, SMG rounds have reduced chance of that.
Based on images from the parade and the like the PLA seems to be issuing the new SMG as a Vehicle crew weapon, which makes sense. Presumably other rear line personnel would similarly be armed, Cooks, mechanics, artillery, Staff officers, Medics… ecta. This doctrine would be comparable to the aim of weapons like the M4 Carbine (Not M4A1), P90, MP7A1, AKS74U and M1 Carbine of WW2. A weapon more compact, easy to carry that is better than a pistol can be fired one handed and does the full power of a rifle. The point isn’t to actually be used in combat but offer the user a means of running away after getting the aggressor to duck.