PC was the exception to the norm on the 8 and 16 bit home computers, Apple as survivor of this vertical integration philosophy has showed OEMs where the profit comes from.

So naturally OEMs are making laptops as extensible as Atari, Mac, Acorn and Amigas used to be.

Want to extend it? Plug an external device, for everything else buy a newer model.

This seems to be the future as classical desktops fade away replaced by cloud instances and NUCs.