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> full laptop-grade Zen 2 processor.

That's exactly what we call a "Mobile" chip in the x86 CPU market.

The mobile phone grade chipsets you are probably thinking is probably called "Embedded" chip in the x86 market. ("Embedded" chips is wider than a mobile phone though)

"laptop-grade" is mobile, in CPU terms. That's why Intel marks their laptop chips with an "M" at the end.

Yes and no. There are desktop computers with laptop chips and laptop chips are much closer to desktop than to a phone for example

In this context, 'mobile' does not mean 'phone', it means 'portable'.

Sure, and "portable" is a useless class of chips. It's too large to be useful.

PCIE lanes are still a function of both the CPU and the motherboard chipset. It's cheaper to build a board with fewer PCIE lanes, and cheaper to have fewer components that need said PCIE lanes.