GIMP sort of fits the PS replacement
Krita is a painting program - Corel Paint
I love Krita but I liked it when it was more of a rasta editor before the remake into a painting program also. I support every kick starter Krita has made.
there is however some cmyk support currently if you need it: https://wiki.archlinux.org/index.php/GIMP/CMYK_support
> Things like non-destructive editing are required by pretty much all users — photographers, designers, desktop publishing engineers, and even scientists. At the same time, CMYK is required only by a small subset of our user base. We prioritize our work accordingly.
I've printed gallery quality prints from sRGB (online and at home), and nobody gives a crap.
Of course no one cares if you print something for your house or a friend and the color is slightly off. But in some industries something like that can cost you a big client and a lot of money.
[0] The difference can be quite dramatic, even without a professional monitor.
Why would I need something in GIMP whose effect can only be seen on paper, except as some kind of Export ... format?
Suppose I have a properly calibrated monitor, yadda yadda, I should be seeing good colors on the screen as I'm editing. When I'm done, good colors on paper can only be seen after the data passes through a professional printer provided its RGB values have been properly massaged into CMYK values. So it has nothing to do with interactive image editing.
It's almost entirely "off topic" for GIMP.
The problem: https://upload.wikimedia.org/wikipedia/commons/1/1e/CIE1931x...
Colors in one colorspace may not have a representation in another. If you do all your editing in RGB and then try and convert at the end, you restrict yourself to the set of colors available in both. To get print colors that are accurate to a provided spec, you need to work in the target colorspace directly, with an editor that will approximate the colors on your sRGB monitor as best it can so you can see what you're doing.
The other way to look at 'laziness to learn new things' is that these people are choosing to do something else with their time - something that they presumably value more highly than learning GIMP. For most people, the set of such things is huge. GIMP is usually just a means to some other end, and there's nothing particularly noble or enlightening about learning yet another piece of software.
Personally speaking, I've used GIMP off and on since before it had either layers or GTK. (It was once Motif.) That said, a few years ago, I got sick of the time it was taking for relatively basic operations, installed a $30 copy of Pixelmator, and haven't looked back. Part of the problem with open source consumer software is just that: it has to compete with commercial alternatives and most of the time lacks the resources to do so in an effective way.