Most of the comments here talk about the GIMP UX. Fair point, but misses the article entirely.

> [Øyvind] is the maintainer of GEGL and babl, the color engines of GIMP. His work was instrumental in (among many other things) the long-waited non-destructive filters implemented in GIMP 3.0

The interview is about Pippin's background (fine arts) and current (as of the time of the interview) work, and in some details about the graphics engine underneath GIMP (GEGL).

FWIW, it doesn't touch on the UI/UX side at all. So even you Photoshop lovers may find it interesting :)