> except if it means thicker, heavier, less optimized devices
Speaking specifically of my MBP Retina, and looking inside, I fail to see how eg. a soldered NVME would make the laptop any thinner. There is plenty of space created by the much thicker heat sink, leaving room for a bunch of components to be modular.
The reason all these components are soldered in is to make it hard for users or small shops to do quick repairs and cheap upgrades.
You must buy a new laptop for a RAM upgrade.
Apple negotiates with component suppliers as a single buyer, drives the price of components down, keeps all the savings to itself, and re-sells the components at an exorbitant markup.
It is ridiculous for anyone to think this has got anything to do with quality.