vesicles
Colonel
Really? What about the Korean War?
I don't think the Korean War is a good example for this. Although PLA was inferior to the UN forces, PLA was not the light infantry in your original scenario. PLA was heavily equipped with artillery. On top of that, PLA had an air presence as well, including Soviets, Chinese and NK pilots.
PLA was well-equipped because they absorbed many light and heavy equipment from the Nationalists who were mainly equipped by the US. There were 8 million nationalist troops fighting the PLA during the Chinese civil war and most of them was equipped with US weapons and equipment. Not many of them went to Taiwan. Majority of the troops and weapons were left behind and absorbed by the PLA.
On top of that, the PLA absorbed many of Japanese equipment after WWII. The Machurian branch of the Japanese army was considered the most elite and most well-equipped among all Japanese units. After Japan surrendered, most of the Manchurian branch pulled back to Japan without bringing any of their equipment with them and left all their weapons and equipment in Manchuria by the warehouses. And almost all of these equipment was absorbed by the PLA. In 1947, PLA went into Manchuria, with the permission from the Soviets, on foot and with nothing but cloth on them. And overnight, they became well-equipped with the Japanese weapons and were able to stand up the American-equipped Nationalists almost punch-for-punch.
So PLA was definitely NOT the type of light infantry you have in mind.