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"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.