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Or even 4G. Would be nice to have a high-memory variant especially seeing that that would require zero changes in the OS unlike most othet hardware variations.

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As far as I can remember, the system-on-chip architecture limits the maximum amount of RAM to 1 GB (I'll try and find an official source, it's probably somewhere in the BCM283x peripherals documentation).

Not to say Broadcom couldn't spin a newer revision of the SoC with a different internal architecture, but for now it seems that >1 GB of RAM would require substantially more effort than just swapping the DRAM module on the board.

Right, RAM is part of the SoC... that probably makes the idea pretty much a no-go.

The RAM was only integrated on the SoC on earlier models (called a package-on-package, PoP -- see https://elinux.org/RPi_Hardware#Components)

Later versions (I think starting with RPi 2) have a separate DRAM chip on the bottom side of the PCB.

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