I like the political compass as a tool for mapping politics beyond left-right (with more dimensions it's even better, but sparsely populated, which indicates that it is missing some symmetries of politics), but it fails to grasp how politics is not as much a spectrum as it is a tree of ideas that mate with each other and evolve, diverge according to circumstances.
You wouldn't say that there is a spectrum between a shark and a dolphin, but they share a common ancestor and have similarities driven by their environment.
It's this nuance of accumulated history that the political compass can oversimplify as a snapshot for people without the time to waste studying political history.