Because using a brush over canvas or a pen over screen requires muscle movement, which registers it as "work" to these people. On average artists tend be politically """left"""-leaning, so they believe in the labour theory of value.
Many artists on both sides agree, that part of what makes art art, is deliberate micro level decisions, or as Sven Stoffels puts it, in his definition of what is art:
"Macro level decisions: These are overarching choices an artist makes, such as the theme of a painting, the plot of a story, or the overall concept of a sculpture. In filmmaking this involves writing the script.
Micro level decisions: these are the finer, detailed decisions an artist makes during the creation process. It includes the individual brush strokes in a painting, the little corrections made, specific words used in a story, or subtle adjustments made on a film set, or even choices made by actors. Each micro-decision contributes to the overall impact and expression of the piece, and nothing is ever set in stone."
The full definition:
(the text is in the video description)
Obviously in this particular example, someone is probably just dragging the grass brush around the Photoshop canvas and not placing every bit of the grass down, with some higher artistic vision in mind. More advanced examples are one of the reasons, why I don't see most AI images as art, but don't have any problems with people using AI.
I use it for things myself, for memes, bullshit illustrations and most of all, things like image cropping (especially at work). I seriously doubt anyone doing any graphics, misses spending hours on manual cropping and then arguing if the hair is cropped too much, or not enough.
