M1 consoles can't boot off external drives if your internal drives are inoperable. M1 consoles can't replace their internal drives. M1 consoles are generally hard to interface with third party thunderbolt 3 devices. M1 consoles don't have full USB-C support. M1 consoles have to emulate most software.
And yet people still question weather M1 are consoles and claim they are real computers. They're not. They're really nice, proprietary consoles with cut corners. And most users will never notice the hardware cut corners because they stay within Apple's walled garden and never open the hardware.