Earlier quoted context omitted.
I'm not convinced that they will ever be shipping their own modem. Or, if they do, I suspect that the reason will be that antitrust laws have forced Qualcomm to make changes to their business model which causes cracks in their ecosystem which Apple is then able to take advantage of. Even then, I think it would be a decade or more before Apple could start shipping their modem. Either that, or Apple gets fed up with th…
Many of the possible outcomes would lead to more flexibility for Apple, who will then immediately start shipping a feature that most pro users would benefit from.
1. How much more profit can you show that they will make if they take the decision to implement your suggestion?
2. How will this help them better meet their regulatory requirements?
For #1, you don't really have an answer. You would be one customer who would be affected, and you might choose to buy their hardware instead. But how likely is that? Can you prove that? And how many more people are there in the market who feel the same way?
For #2, your suggestion actually makes the regulatory situation worse, since you're now adding a cell phone modem to what was otherwise "just" a computing device. And that brings a whole host of additional regulations into the mix, including import laws and tariffs. And any lawsuit that is filed against Apple that could involve protectionist measures against intrusion of external businesses into local cell phone politics would now be able to stop all imports of all laptops of this type, since any of them could presumably have a cell phone modem in them.
For Apple as a corporation, I'm seeing effectively no upside here, and all downside.
For you personally, there would be a lot of upside. And people like me would also benefit. I just don't see a compelling argument that would convince Apple.