![]() PCI-e fan out could primarily be done from a base board PLEX switch, but when PCI-e v5, CXL 2, etc come along probably not going to be "future proof" viable. People want the old 4,1-5,1 tray to come back but where the subcomponents are on the old 4,1-5,1 board moved significantly. Fighting that tension just gets you a more and more proprietary and long term change brittle connector back to the base board. That will put very high tension to pull the back edge TB ports, video out, and primary boot SSD all onto the tray along with the RAM. ![]() T2, PCH chipset, Thunderbolt controllers, display output controllers all get pulled into the "system on a chip". The M-series chip largely subsumes all of that. The 4,1-5,1 main logic boards had the I/O 'Southbridge' chip with large diverse communication fan out on the main board ( and not on the plug in tray). The wider the diversity the more long term brittle that connector is likely to be. All with different standard versions evolutionary cycles. The Apple SoC is a 'system on a chip" so there are a wide variety of different types of communications channels coming off the package. Nor would it control costs an any significant way as who have an extremely complex, proprietary socket to plug the board into and a board with lots of stuff on it. You would have perturbed the internals so that would have flipped a tower board into a rack enclosure board and vice versa. If you take the bulk of the main logic board and turn it into a horizital/vertical (tower / rack ) plug in card then it won't fit inside the case.
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