I agree with everything except the end. Apple is not sitting on their hands. They just have a different vision of where computing is going and are pursuing it vigorously.
1) Apple sees iCloud as replacement for local storage. Everything will be in the cloud and only the files in immediate use will be stored locally. This is how iPhones & iPads already operate. There is no need for local backups like Time Machine and related products like Time Capsule.
2) Apple wants to make computers that are as simple & non-technical as possible. That means built-in monitors and memory & storage that can't be changed later. Think laptops and iMacs (or iPhones & iPads) rather than Mac Mini & Mac Pro, neither of which has been changed for three years and possibly never will.
3) If someone wants to have an external device like a monitor or a local backup, there will be an option, though designed & made by a third party even if sold by Apple.
Here's a related set of comments, though I don't vouch for their accuracy:
https://hardware.slashdot.org/comments.pl?sid=10191963&cid=53786433