I fully agree with this. Moreover, the phrase "Don't reinvent the wheel" is not meant to stop you from reimplementing stuff. I just means that you should have

I fully agree with this. Moreover, the phrase "Don't reinvent the wheel" is not meant to stop you from reimplementing stuff. I just means that you should have a close look at what already exists before reimplementing it, so you don't follow the path of trials and errors that others have already gone for you. The best sign that someone reinvented the wheel is that the "new" stuff is completely inferior to what already exists. And this appears to happen quite often. So in my experience, the phrase "Don't reinvent the wheel" is merely meant to counteract the NIH syndrome.