besides being fragile because small thin metal sticks are easy to bend, which I believe has been answered sufficiently already. They haven’t been made more durable because it’s just a non issue, the connection between motherboard and CPU is not designed for frequent cycles by untrained people. And in fact most people aren’t replacing CPUs very often, with care and attention it’s easy to not damage the pins. A factory worker, repair technician, or hobbyist will take their time to install it correctly and safely. Whereas something like USB is a connection that is designed for frequent and abusive cycling by a broader audience, so durability is a major factor in consideration for it’s design.
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