Re: Solder not Socket...
Excellent re-sale value?
In a few years time, the memory and storage will be considered low to average spec at best, and the battery will have lost a sizeable chunk of its useful life as well. Now with a 3 year-old standard laptop, you can up the RAM a bit, pop a new shiny SSD in and replace the battery. Result is a nicely refreshed machine with decent performance, full battery life and some genuine re-sale value as a result.
But who wants an older Macbook knowing that the battery will soon pack in, and that you're then stuck with a mobile device that only works near a power socket?
Apple doesn't want resale value. They want your shiny new kit to wear out and be thrown in the bin as quickly as possible so you have to buy their next shiny product.
Incidentally, I agree with the author. I own two Mac Minis that are a good few years old and have seen several upgrades during their life. I will not be buying another one with all its now-soldered components.