Someone should sit every new PhD student down and explain to them that the goal isn't (or shouldn't be) getting publications or making an impact or getting a credential or a job. Of course you have to keep an eye on those things for practical reasons, but you can't lose sight of the goal which is to improve your understanding. Not even "our" understanding, just your own. If you pursue that and have a bit of talent (and luck) you will eventually push your understanding past that of the community on a given topic and you will write it up so that they may improve their understanding by reading your work.