The Vietnamese military weapons are so outdated. Why does the world overrate the Vietnamese military's capacity?

 It is true that Vietnam's weapons are a bit outdated!

But bullets fired from ak47 guns can still kill people like modern guns, right?

Anti-tank guns can still destroy tanks, right?

and the problem is!:

The total military personnel is 5.48 million, accounting for 5.6% of the total population. Of the overall figure, the reserve personnel hit 5 million, ranking 1st among 138 country. The fit-for-service is 41.8 million (13rd) while reaching military age annual is 1.65 million (15th).

Vietnam, the country of 97 million people, after the end of the Vietnam War in 1975 has compulsory conscription for men of 18 to 27 for the enlistment of two years while the status for women is voluntary.

Vietnam also ranks high in other categories including natural resources, including oil production; logistics, including labor force, ports and terminals, roadway and railway coverage, and serviceable airports; and geography, including usable waterways, shared borders, and coastline coverage.

The report also reveals that Vietnam's defense budget is around US$5.5 billion, rising from US$3.3 billion in the previous version.

they spend 5 billion dollars just to feed 5 million soldiers in any given period! and that's equal to the number sodier of all the NATO nations in continental Europe! How much do you think nato's defense budget is?

The technological gap can be shortened in just 1 generation, but the social construction gap to raise an army like the Vietnamese takes about 100 years of continuous war!

and basically Vietnam has been peaceful for 31 years! And it is one of the most militaristic countries in the world!
thankfully the huge army was led by a rather gentle and agreeable communist party!