Making everything small is expensive. You have to custom design a lot of stuff.
On the other, everything being highly modular leads to low prices. I can choose from thousands of power supplies in my desktop, and thousands of cpus, disks, graphics cards
Case in point, the (internal) monitor cable in my macbook broke. Several hundred bucks for the custom one-off cable assembly and its installation.
On the other hand, when my desktops monitor cable broke: unplug the old one, and just grab another one from the big pile of cables at work.
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