Why are they fragile? Because they are small. They are small because more pins in less space mean more connections, and more connections mean faster CPU throughput.
And they *have* been redesigned in more recent years. Instead of a bunch of pins on a moving, replaceable part, the more modern design essentially has the pins on the motherboard. But because backwards compatibility is important with consumer electronics, only the newest machines will have this (more expensive) feature.
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