It was more intended to point out how ridiculous it is to think that profit is the ONLY reason to do things. It’s not. There are considerations in Design, engineering, marketability, etc.
You say soldiering parts is about increasing profit - have you ever considered it being about reducing variability? Apple has made a big practice out of being able to squeeze every ounce of efficiency out of components and the less variation they have to account for on the hardware side the more they can do on the software side.
I think it would a huge mistake to think that Apple doesn’t know what it’s customers want - and not just the ones on the message boards.
I’m glad you’re switching to non-Apple PCs - there are far more options to buy from where you can find exactly what you want - though I would point out that you’re not free from non-user upgradable machines entirely on the Windows side. There are LOTS of PC manufacturers that are making laptops and tablets the same way Apple makes them (including Microsoft!).