@jwz the chips themselves are quite interesting, tho idk how they'll hit that lower USD cost per unit, esp with eMMC on board? Although they mention a MicroSD card.
https://arace.tech/products/milkv-duo-s?variant=42703107195060
The non-eMMC unit has microSD slot on it, and in theory you could solder on a chip in the future, it just voids warranty per Arace Tech email support:
eMMC Boot: In theory, you can solder an eMMC chip onto the board after purchasing it, and the board supports booting from eMMC.
PoE Support: Yes, you can add PoE support separately by using the PoE HAT. You just need to solder the 4PIN header on the board first.
Please note: Although both modifications (soldering eMMC and the 4PIN PoE header) are technically feasible and will work normally after soldering, any manual soldering will void the warranty. We will not be able to provide after-sales support for the board if it is damaged due to self-modification.