1) Because that's how most designers create layouts who can't code an not really interested in doing so.

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.

Does anyone use SketchApp to design at all? Just curious, I thought Photoshop was being replaced..

Yes, millions of designers use Sketch, Invision and Adobe XD. Photoshop is getting disrupted at every low end feature-set. Photoshop will remain the standard for complex image editing despite AI or whatever, because decades of cutting edge research and patents.

Photoshop is still an industry standard, but more and more companies switch to Sketch or some alternative. My ex is a designer and I've seen her doing some projects in Sketch when the client borrowed a Mac :)

I design all my sites in Photoshop before turning them into HTML/CSS. It's a lot faster than fiddling with CSS, especially if I've been given a lot of freedom in the brief.

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.

Because the best artist i know don't know css and html. They are not coders but drawers.

you forgot to mention emacs..!