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I still wouldn't be impossible for them to throw a DIMM socket in there. Even if the expanded memory is at a higher latency, there would still be many perfectly good applications for it.

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It seems like there would be a lot of added complexity in the memory controller for this to happen, if it’s even possible. LPDDR5 is not and will never be available in DIMMs, so you’d be talking to two different signaling standards for the onboard vs the expanded RAM. You could switch to DIMMs across the board, but to keep performance equivalent you’d trade-off a significant chunk of battery life.

I can’t off the top of my head think of any CPU that’s ever supported running different DDR standards side-by-side simultaneously (there were some dual DDR2/DDR3 boards back in the day, but it was an either/or proposition).

A standard SO-DIMM together with the socket to add it is thicker than a MacBook Air's (or Pro's) bottom part, when measured outside to outside.

It's cramped inside, so no go.

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