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The reason is signal integrity. Running a high speed signal (never mind a bus of 64+ of them) through a connector is hard and takes a lot of power because the connector can seriously degrade the signals. LPDDR can be low power because it doesn't have a "memory stick" abstraction, just memory chips and controllers. It's not the resistance that kills the signal, it's the inductance and the impedance mismatching.

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LPDDR3 DIMMs exist. I assume everyone is talking about LPDDR4, which seems to use 0.1V less.

But the majority of people couldn't give a toss about how much of their laptop ends up in a landfill. They're using paper/glass straws, you see.

Perhaps electronics landfills should be local again.

I think you're referring to DDR3L DIMMs, which are just a down-volted version of DDR3. LPDDR has never had DIMMs because of signal integrity issues. They take power to resolve.

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