They are literally useless. even when something is explained to them they still mess it up, or need the same thing explained again the next time. Most of the commits they have was someone wasting their time to explain change by change how to do it. It would have been worth the time investment if they learned and were able to do things on their own. at this point but they aren't and freeing up the people who have to consistently spend their time helping them will be a net positive in productivity.