This is a good point. People get hung up on feature parity and niche features that they often don't even use. I guess they'd be more comfortable if there were zero downsides to switching to something else, but it's rarely so simple.
Some people also just think they need photoshop to edit images at all, they've convinced themselves all the expensive pro tools are the only thing worth using. We've got people roleplaying as graphic designers, music producers, and movie-makers all at the same time when they don't need much of any of that. I guess it's a convenient excuse to not switch to free software or GNU/Linux and not learn new things. Doesn't apply to everyone, of course.
Personally I use LibreOffice maybe once or twice a year at most. I don't even see a big need for office suites in general. I deal in a lot of plaintext, which I suspect would be fine for many, but they're used to jotting down notes in MS Word and don't wanna change. I also almost never user GIMP or Krita. The biggest usage I used to have for an image editor was cropping screenshots, but now we have screenshot tools that can just select a smaller area to begin with, so I rarely need to do any editing. I'm also used tricks like making a very small floating terminal to place as a black bar censor over things at times.