The lack of upgrade option is slightly ironic
Given that the original Apple II was a runaway success precisely because it could be upgraded and extended so easily.
Having said that, I have never yet upgraded my laptop. My desktop is another matter. That has had its guts removed frequently, and between complete rebuilds has had many graphics card, memory, and disk upgrades. Most people expect to replace laptops every 2 or 3 years, which is why they wonder why I still use my battered old VAIO SZ (8.5 years old). The reason is probably that I am cheap and/or too lazy to get another one.