> but software developers tend to forget that software is just a tool, and sysadmins use it like a tool. They just want to get in, get out, and move on to the next problem

Which is exactly why developers don't get to write any documentation other than the bare minimum: software for the client is just a tool, once it is running they want developers to move on to the next problem, not wasting time on any additional documentation (which, arguably, is not strictly a developer task, more a QA one).