If the authors used the same method to improve GIMP, they’d be introducing a bunch of slop code to GIMP. This code is not going to be of GIMP quality.

I also doubt this will hold a candle to GIMP for the aforementioned reasons. It might appeal to a small audience, but I do not expect it to dethrone GIMP any time soon.

Comaps works well for me. If it’s not comprehensive enough, contribute! OSM is crowd-sourced.