Intel is already lagging behind ARM by single core performance and power efficiency.
A14/A15 Mac will outperform Intel counter part by huge margin and I hope they will keep the macOS like it is today.
Remind you Apple totally isolated Mac Catalyst and iOS. They removed all deprecated APIs in Mac Catalyst makes it incompatible to iOS. It looks like Apple does not want people run iOS app directly on macOS.
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This amazon CPU has similar setup.
www.anandtech.com
It out perform Intel Xeon Platinium.
It is way faster than the 28 core Intel Xeon W inside 2019 Mac Pro.
Data center do not need a GPU. These are workstation targeting same people Mac Pro did.
All this case shows how capable ARM chip can be and you do not need to purchase them.
You said ARM can not game and it can. You said ARM must be slow for video editing and it is faster than the fastest Xeon W.
CPU instruction never really affect their performance. ARM is faster today just because x86 was a 40 years old design and is a burden for modern CPUs.