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Years ago, when I first got into computers as a hobby (late seventies), there was something of a debate about whether or not chips should be socketed or soldered. The argument in favor of socketed chips was that users could easily replace chips that failed, or that they wanted to upgrade.

The argument in favor of manufacturers soldering chips to the logic board was that soldered chips were much less likely to experience failures.

(As I recall, every single chip on the logic board of my first computer was socketed.)

Manufacturers and most customers would probably agree that a design that lead to fewer hardware failures was inherently superior. Over time every manufacturer moved to soldered chips, and most customers were better served by socketed. chips.

Getting back to your point number 3: Adding a slot for removable memory introduces a degree of operational complexity. Users suddenly have to keep track of whats on internal memory, and whats on the removable memory.

Consider the Microsoft Surface RT. It has an SD card slot, but the OS doesn't let you install apps on that slot. Imagine what would happen if a user removed a card without realizing that a currently-running app was on that card?

Even limiting the cards to data introduces problems. What happens when you're editing a document, and you remove the card?

Oh, you say, that's not a problem. The user should remember which apps and data are where. Sure, we can do that, but who wants to?

You can design a device that best serves the needs of average users or techie users, but its very hard to do both.

As evidence of the complexity introduced by such a simple change as removable storage, I submit this article:
How To Manage the SD Card on Android Phones Like a Pro

I don't want to "manage" my device's storage. I doubt most users do.
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