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I do agree that they have slipped in this area, though I think it's an inevitable consequence of being a trillion dollar company. Apple was only able to become a trillion dollar company because their marketing and operations were easier to manage, and companies in a market-leading position typically grow until the point their size overwhelms their ability to steer the ship.
Maybe the experience in USA with Apple Stores is different, but when forced to buy a Mac by work recently I had to deal with some ridiculous wait times just for asking for 32G ram.
One way. The other is, if your computer breaks you either upgrade or spend a lot to have it repaired by Apple. There's no downside in using non soldered down ram and storage, it's just the nth lock in strategy.
Okay, but then they’d lose money by not selling their proprietary parts.
Quality problems? You mean like the over-engineered keyboard they've had issues with for three years?
Some decades longer design patterns are battle tested/aren't broken, yet Apple continually tries to break them - thinness to the extent that they now solder memory/disk to the board, putting out a keyboard design that isn't sufficiently tested, and all sorts of Catalina issues that people have documented online.