Hot air rework is more accessible than ever. This video is kinda over-the-top breathless, but removing components and reballing new ones isn't rocket science.
It is and will always be rocket science to most people, and orders of magnitude more difficult than swapping a drive or ram sticks.
Apple has been gluing down the NAND on their phones: https://youtu.be/KRRNR4HyYaw
If that practice spreads to the MacBooks, you'll also need a CNC mill.