Investment in learning something like vi makes sense in the nix world, where it is available everywhere by default. On Windows side the problem is that there's

Investment in learning something like vi makes sense in the nix world, where it is available everywhere by default. On Windows side the problem is that there's no comprehensive "default editor" to learn. If you are doing server side sysadmin work on different environments then you might be limited to what is already available. Often you don't want to go through the trouble of getting a specific editor installed in order to edit some config files (3rd party software may require approval, somebody to install it, etc).