"WordPress can do all that" Can do all what? What WordPress can do out of the box is far less than what it can't do, which is every custom website functionalit

"WordPress can do all that" Can do all what? What WordPress can do out of the box is far less than what it can't do, which is every custom website functionality one can imagine; thus the custom backend. I agree, trying to stretch WordPress, Drupal, etc. beyond core functionality is asking for pain, not to mention dog slow performance.