Because conda (and by extension, Anaconda) harms the Python ecosystem with their non-standard package format. If Continuum Analytics cared about making scientific packages like numpy and scipy more accessible, they would make binary wheels for Linux/Windows/OSX with the MKL. There is no technical reason that prevents them from doing this. Instead they lock you in to their package/environment manager and create confusion when you have pip and conda packages installed at the same time.