Vietnam has twenty times the population of Singapore; it's not surprising that it'd be easier to find good developers there. It's also harder for good Vietnamese developers to emigrate to somewhere with better pay like the US, compared to Singaporean developers.

>And saying that Vietnam has more creativity isn't exactly a high bar given the similar values of Confucian hierarchy here!

I know some mainland Chinese who live in Singapore, and they often complain about how closed-minded the locals are. If Vietnam is similar to China in that regard, then it might well be less hierarchical than Singapore (Chinese culture seems much less hierarchical than some other Confucian-influenced cultures like Japan/Korea, maybe due to the communist revolution actively demonising Confucious, and Vietnam also had a similar revolution).