Increased integration has been the goal of most everybody involved in designing and building computers, since before transistors were formed into integrated circuits.
At the same time, a goal of less necessary maintenance, too.
Vacuum tubes (valves) are gone.
Connectors and moving parts are removed.
The field-replaceable units (FRUs) get larger and larger, and whole peripheral units get swapped where that's possible.
It used to be that you swapped a head-disk assembly within a disk drive. That you had periodic maintenance visits to clean or replace the air filters on your servers and clean out the dust bunnies and dust rhinos. That you isolated to the board and repaired it, or used a wire-wrap tool to fix a loose wire on the backplane. That you unscrewed and swapped a switch. That you modified configuration switches to re-address I/O cards.
This trend is all part of what was once known as solid-state electronics. Where a designer looks to remove the "stuff" that fails and that takes up space and time and manufacturing effort, that requires stocking more SKUs in manufacturing, whether that's connectors or CRTs or disk drives or daughter-cards or whatever. And you work to remove the humans from the repair and maintenance process where you can, as that's a source of problems, and costs.
And yes, the hobbyist and enthusiast market has different goals and designs than the mass market. If you're looking to tweak and incremental upgrades (short of swapping FRUs), then you probably won't be buying a MacBook Pro Retina.