I think this gets it wrong. The real reason enterprise software sucks is that enterprises have complex and unique workflows and would prefer to buy software that they can fit to their workflow rather than change the workflows of their profitable business with tens of thousands of staff who will need retraining. If you look at all of the most successful software of all time they are the complete antithesis of the Unix…
Nobody hates Photoshop. In fact it's one of the most loved software out there. I'm a developer and a Photoshop user and love it. The Unix philosophy would be a disaster for a image editing software (ImageMagick much?) Once a developer who spent all day in VIM & co was honestly arguing with me that Photoshop should be a command line app. I filled that under "shit developers say" and "delusional".
I hate the price and subscription model, and the learning curve has some steep spots, but once you're up and running, it's fantastic. I want to like Inkscape, but I've hit too many weird bugs (text getting squashed, transparency disappearing randomly). I'm curious about Affinity Designer though.