[theshrike79]

But this is an M series system, it's not running of off-the-shelf Kingston DDR4.

[cmatthias]

Yes, and? Apple's wholesale RAM cost is likely even lower than a computer with socketed RAM, due to economies of scale and fewer parts overall (RAM soldered directly vs. RAM on a separate PCB, plus a socket soldered to the main board).

[JustSomeNobody]

Then it's probably cheaper to add RAM.