Sure. But if the NVA thought the SKS was sufficient why did they bother to resupply with AK47 at all?
Regarding the M14 - it wasn't exactly a great success story either at the time of it's introduction. If it makes you feel any better I wouldn't choose an M14 as my bug out rifle either.
Not that it really matters, but the Tet Offensive took place in the latter stages of the war when the main NVA rifle would have been the AK47. I don't need to "google" or watch "Platoon" to know that. I was old enough to follow that war in real time, and I had family members involved in the conflict so I was very interested.
The North Vietnamese produced their own SKS rifles because the NVA did not have lots of money or technical capability, especially in the beginning of the conflict, and the SKS was simple and cheap to build. Even then they still switched to the AK47 as fast as they could. No doubt that the NVA used SKS rifles effectively, because the simple design suited their tactics early in the game, which would have been to arm and field combatants as quickly and cheaply as possible. It was well suited to that.
I have put somewhere in the neighborhood of 15,000 rounds through 2 SKS rifles. I know what they are good at and I know what they aren't good at. I'm not making this stuff up.