are they ?
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https://arstechnica.com/gadgets/2018/11/apple-walks-ars-through-the-ipad-pros-a12x-system-on-a-chip/
Once get out of wading through the single thread drag racing benchmarks, the A12x would have to improve by 38% to even get to parity with the MBP 15" 2018. Funny how when AMD x86 solutions were 20-30% behind Intel solution they were a 'dog' and Apple shouldn't touch them with 10 foot pool.... but Apple 30+% behind ... well just around the corner and they're great.
No Thunderbolt (and PCI-e lane provisioning) . No USB 3.1 gen2 , one internal drive , drives 3+ screens ... nope. And that is all with Intel behind on process tech. When Intel moves forward and next gen "big" A series just does small increment 7nm 7++nm , they likely aren't going to make up huge ground just on process gains.
Apple could goose these short duration geekbench score by throwing a couple more low power, 'small cores' in there that can light up for the duration of this kind of benchmark .... but that is mostly just a cheat on substantive , longer duration workloads.
[ The iMac Pro is about 37,129 on other charts in that article. That is 106% improvement just to catch up. Just to put some Mac pro context on this. ]
Dropping Intel in the one port wonder MacBook, sure. Same number of ports as iPad Pro. No Thunderbolt. Maybe drive two monitors. .... a match better match in direction. Apple could make it even thinner. ( whereas should really stop screwing with anorexia with the MBP line up. ). If Apple's objective is to crank out range laptops that consists of two pieces of glass wrapped in aluminum shell ( https://www.macrumors.com/2019/02/04/apple-exploring-new-glass-panel-keyboards/ ) then sure they probably need their ARM SoC. But not sure why they need to take macOS that way. iOS would work too if on that kind of quest. Lots of folks there already happy with typing on zero key travel, glass keyboards. Decoupling the Mac from the OCD objective would. That mania was a contributing facto to walking the Mac Pro into a design corner. Detaching folks primarily fixated on that from the Mac product line would probably result in an improvement.
They are planning to start replacing MacBook with their own processor from 2020. Check the news first.