On the other hand, carefully written doc from 10 years ago might not even apply. So you're going to have to do things from scratch again regardless. Often, that

On the other hand, carefully written doc from 10 years ago might not even apply. So you're going to have to do things from scratch again regardless. Often, that's not really a big deal. And it can happen just as well to stable stuff or cron'd stuff that was working fine for x years until it stopped working.