The thing is as someone who twenty plus years ago was able to write the webserver at socket level and so on, if you handed me a keyboard today I have forgotten all the context, the skills - they have pages out of my brain and now have redis and javascript and hadoop.
But you know those things exist and how things relate to each other and affect each other, or could affect each other, and you don't need to already have a mental text book in ram to solve a problem. I don't know you and yet I know this.
