> it probably would help if you'd listen to a person from the world class hardware team in question who worked in exactly this world for years, spanning all the devices discussed.

Why? Anyone can see the large number of aluminium cellular devices already on sale, including from Apple. There is nothing magical about a laptop form factor. Would a different design from the non-cellular supporting MacBooks we have today be needed to acommodate antenna windows etc? Sure probably! But to sit here and argue it's not possible is patently silly when we already have aluminium devices with cellular you can own.

Would attaching a hinged keyboard to a cellular iPad prevent its cellular connection from working? No, of course not. The same is self-evidently true of incorporating antennas to the lid of a refreshed MacBook design.