I am guessing he works at a place that has a lot of servers that he connects to, and he wants to be able to use his editor on whatever server he is on.
I know this is an issue where I work. We have 40 thousand plus servers, and we aren't going to have everyone install their editor of choice on all those machines. If I have an issue I need to check on a server that requires some text editing, I have to use one of the default editors.