Ultimately they’re in this huge success mode which is great! They just have to be careful Not to overbuild additional supply and end in a situation where demand tempers for some reason and they are now in a glut
Apple A12 is 83.27mm^2 (7nm)
Apple A13 is 98.48mm^2 (7nm+)
Apple A14 is 88mm^2 (5nm)
Not a very big difference. Remember, Qualcomm's chip includes a modem while Apple's does not (at present). Qualcomm has also been putting a lot of resources into other areas like neural processors. Their upcoming 888 claims 26 TOPS (vs 11 TOPS for Apple)
Cache is a very common misnomer too. A14 has 8MB of shared L2. 888 has 4MB of shared L3 plus 1MB for the X1 core and 0.5MB per each A78 core. It also has 3MB of what they call DSU cache which serves as a kind of general cache for everything on the chip that needs to hit memory. That's actually 1.5MB more total cache than Apple offers.
The iPhone and iPad are using up a lot more of TSMC's capacity than the Mac. Also most sub $1k laptops and lower end phones not getting chips with the latest TSMC silicon in them. They are getting older 14nm Qualcomm, AMD, or Intel CPUs.
EDIT: I previously implied all sub $1k laptops had 14nm CPUs which isn't true.
Now, these models do exist, in theory. I challenge you to find any stock, though, and that's going to hurt AMD.
(HP, which I don't recommend, was selling a 4700U based product starting at $400 on black Friday on their web site)
edit: Heck just checked there are loaded Asus ROG G14's in stock at a local retailer for under $1200 (that is 4900HS+RTX 2060). Pretty much one of the fastest laptops out there.
Apple market share is simply not large enough to do that. Yes their numbers are huge, but there are lot more people who cannot or will not buy laptops priced $ 1,000+ than there are ones who are ready to pay that globally.