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Another reason is the something like 150% memory bandwidth and I'm sure there are other simple wins along those lines.

The M1 isn't necessarily a win for Arm in general. Other manufacturers weren't competing before and its yet to be seen if they will.

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It's the memory stupid!

Specifically, the memory -latency-.

By going on-package there's almost certainly latency advantages in addition to the much-vaunted bandwidth gains.

That's going to pan out to better perf, and likely better power usage as well.

Is M1 on package? Or is it on-die that people keep getting wrong

The memory and CPU are on the same package, not die.

M1 memory latency isn't noticeably lower than x86.

150% compared to what?

The latest i9 and the latest Ryzen 9, ie the competition.

Intel Tigerlake and Amd Renoir both support 128bit LPDDR4x at 4266MHz. Maybe you're confusing the desktop chips that use conventional DDR4? The M1 isn't competitive with them.

Oh those are pretty new and I haven't seen any benchmarks with LPDDR in an equivalent laptop chip. Do you have a link to any?

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