Why are design mockups done in photoshop, when HTML and CSS can be faster and easier once you have the basic components??
2) It demonstrates AI capabilities on a new level.
3) If you design in PS or Sketch, then you will create more interesting layouts, because you won't skip things that are inconvenient or hard to do.
Completely designing websites in PS before even opening the code-editor has really improved my workflow. I know exactly how it has to look because I have a visual reference that's been OK'd by the client.