It's called marketing, it has very very little to do with component costs.
For no particularly rational reason on various fora, YouTube posts etc a number of posters whined about how THEY wouldn't pay the price for a 32Gb RAM, high processor spec'd tablet unless it was xxxx (some arbitrary made up number without link to actual costs), in general 1K USD.
So Minisforum have taken a punt on dropping RAM to 16Gb, eaten a bit of the profit margin and voila, sub 1K USD.
Oh and have you seen the margin that Apple, Microsoft et-al put on RAM variety on their devices?