Completely agree. And extending the last point: the ability to, if needed, learn how the thing works by yourself and try to fix it/modify it to fit your needs.

Completely agree. And extending the last point: the ability to, if needed, learn how the thing works by yourself and try to fix it/modify it to fit your needs. You don't need prior knowledge of plumbing to try and fix your broken kitchen, specially on today's world, with so much free information available. In a similar way, you don't need to be a software developer to hack your way through and learn how a program works and try to change it.