> 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.

The iPad itself and competing MacBook/MacBook Pro-like aluminum laptops from other vendors (Dell, HP, etc.) are existence proofs.

You didn’t read the discussion of the cellular ipad having the plastic band, or that prioritizing no plastic band is a problem if you want antennas capable for useful cellular reliability

No, the cellular iPad and other devices are indeed proof positive. The exact same cellular window solution could be applied in a redesign of the MacBook. No one is disputing aluminium blocks radio waves - the dispute is your constant argument it can’t be done because it would require a giant RF window - there is no reason a future design can’t neatly incorporate an antenna system, just like it has been done on many other aluminium devices - including iPads, iPhones and Apple Watches.

Having built 5G systems for hobbyist computer boards (Pi etc), the antenna required is not so very large either.

A MacBook is not and has never been a seamless block of aluminium - there are plenty of design choices to be made to help hide or minimise any antennas.

Yes it’s possible IF the case is changed. Bear in mind different bands (as cellular ios devices support) can force a different antenna geometry than a single band (regardless of coding schemes).

Your “plastic band” argument- indeed, most of your arguments on this- fails to acknowledge the pleasant reality of the ipad pro’s.

My 2020 ipad pro 11” does not have that unsightly plastic band, nor the iphone 15 pro.

As far as aesthetic elements, these enclosures appear essentially as metal and glass, an appearance not markedly different than existing macbook appearances.

Even the iphone mini 13 manages to fit effective cellular arrays in its compact form sans the big plastic bands on those ipads you mention. And despite its diminutive size, the mini 13 can still manage a reliable call over cellular for hours at a time. With the greater real estate offered by the macBook form factor, there are broader options for effective antenna arrays and also their power supply versus phones and tablets.