Earlier quoted context omitted.
> In a universe where you want high-performance energy efficient RAM [.....] You simply can’t have this with socketed RAM. You make it sound like a prerequisite. I'm pretty sure the reason LPDDR is Low Power is not due to (currently) being unavailable in socketed modules - that would seem to be a side-effect of the original target market (smart phones). They are just some BGA packages, I see no reason they couldn't b…
I've never done anything beyond amateur electronics, so sorry if I'm way off base here, but it at least seems intuitively plausible to me that soldering the components to the board allows them to work reliably at lower power. With a pin and socket connection, you've got to try and be at least reasonably resistant to corrosion or other sources of less-than-perfect connection. That said, I don't know that RAM chips are…
I definitely remember ordering a replacement headphone socket board for an old MacBook and just putting it in myself, and I've done similar with, eg, the connector port board on a PS4 controller.
But I guess this is one of the hazards of Apple having their AppleCare programme— they can do the math and calculate that saving a dollar on the cost of making and mounting and connecting that extra component still makes them money even if they have to eat the occasional full motherboard in the first three years of ownership.