I think this is due to the speed at which techies' skills rot. You stay in the same place doing the same thing for 5 years and you have a skill set that no exciting employer (incuding your current one) is going to want. That's why we all do side projects. That's why we do stay in jobs that let us constantly improve ourselves. It's not that we're fickle, our tools and skills are fickle.
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I think this is due to the speed at which techies' skills rot. You stay in the same place doing the same thing for 5 years and you have a skill set that no exciting employer (incuding your current one) is going to want. That's why we all do side projects. That's why we do stay in jobs that let us constantly improve ourselves. It's not that we're fickle, our tools and skills are fickle.