I keep looking at Affinity Designer, as I'm keen to drop Adobe from my pipeline, but the lack of plugin support means this isn't possible and so, even though I have affinity Photo I don't use it, as it's easier just to stick with adobe until I have replacements for PS, Illustrator and Lightroom that work seamlessly together and have the plugins I need.
I'm sure others are also holding back from jumping ship for the same reason - plugins need to be supported or Illustrator will continue to be required by pros...