So much this. I don't trust an engineer who's never done maintenance work. And I really don't trust an engineer who's never been on call. I find that they write

So much this. I don't trust an engineer who's never done maintenance work. And I really don't trust an engineer who's never been on call. I find that they write vastly different (usually much simpler) systems. Personally I will now only build a system that I know I can troubleshoot at 4am while drunk.