Thats not how it works, especially in tech. Newcomers would need quite a bit of training in the way Riot codes and does things, that it would be good for long run but would mean in short run their educated/qualified employees would have to work more. This would actually mean lower productivity from those people for a while.
Things like coding languages, workarounds, coding patterns, documentations etc are not things that someone can just see once and start writing their own code within few seconds. This is particularly important when you consider that League is a 10+ year old game with some real weird/spaghetti code without proper documentation at times.