The problem I have with this, is that if you don't get to use your new shiny tech in your job, over the years you tend to forget the knowledge, at least that's

The problem I have with this, is that if you don't get to use your new shiny tech in your job, over the years you tend to forget the knowledge, at least that's the case for me. Does everyone else have eidetic memory? I found myself having to look up syntax and idioms of languages I was productive in a decade ago.