different cpu architects - surface book is still just x86 under the hood.
ios is arm, macbooks were x86, now is arm. thats why. it is impressive what rosetta 2 does, but it still impacts a significant performance and battery hiut
Now why they didn't make a touch macbook/detachable screen with osx is another question, and likely because there isnt the demand. i was just addressing why you couldn't just smush ios and osx together/run both on the same device
Hell, Microsoft has had a tablet offering since 2003 or earlier. It’s hard to do touch and traditional and do justice to both.