I hate sketch, not because it's an Apple only product, but because it's horrible to navigate. I couldn't imagine using it with out a side scrolling mouse, and none of the "normal" keyboard shortcuts work. The plugins are horrible and almost always cause more problems then they fix.

But the biggest issue, and this may be the designers that I work with, but I'm not sure. The files are huge. The smallest file I have worked with was 80mb, yesterday I received a file that was almost 1gb! It had every page, with all the text, in every size, it was insane, I turned the job down based on that alone. It had a decent budget, but the client expected way too much. And the designs for each page were different, which as we know can cause issues for the overall UX.

The screenshot is from my PC as I don't have my OS X VM fired up right now, but that's a real file, just shown with XD.