Reinvent The Wheel
Indeed. If anything, "Don't Reinvent The Wheel" should be used as a call to arms for deeply educating yourself about all the existing solutions – not as a bludgeoning tool to undermine those who legitimately want to build something better or improve on what's already out there. In my experience, sadly, it's much more the latter than the former. So, no, you shouldn't reinvent the wheel. Unless you plan on learning more about wheels, that is.