Microsoft made that possible at least 6 years ago with Surface Book. Why couldn't Apple? (spoiler they could)
https://youtu.be/SdQQ8uvylJ0?si=as1k5R5BhFTZiys_&t=106
And there are other brands too: https://www.ign.com/articles/best-detachable-laptops
Took me 10 seconds to Google. Why do people go to these great lengths to defend giant soulless corporations is beyond me.