I'm pretty sure macOS already runs on ARM in Apple's labs.
Arguably getting Windows to run on ARM is an even bigger job, but whaddya know? It runs on ARM. Yes, there are limitations and compatibility issues, but it works.
I could see Apple using a 13" ARM MacBook as an introduction to macOS on ARM, and then release other machines later. This would make sense, as I don't think Apple's current or likely even the next Apple Ax ARM chips are suitable for high end machines.
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Only at best marginally better so far.
5029/22412
In fact, this seems to be almost identical. But we shall see as time goes on. Also, I suspect the 2.6 GHz 8850H in the MacBook Pro will do better with extended non-bursty benches like Cinebench. Here it is with Windows machines:
https://www.notebookcheck.net/8850H-vs-8750H_9578_9576.247596.0.html
View attachment 770585
1276 vs 1176 is an 8.5% difference between the 2.6 GHz 8850H vs 2.2 GHz 8750H.
BTW, for reference, my 2017 MacBook 12" Core m3-7Y32 gets only 265 in Cinebench and a little over 7000 multi-core in Geekbench 4, and I have no issues with its performance for my business type usage.