Well, I explicitly said that I dislike Gnome for that. Sure, there are switches that are fine for actual customization, in order to actually adapt to personal preferences instead of work around technical weaknesses. I love how configurable Plasma is.
When I read further, about your scrollbar example, I wasn't sure if I would consider that a good example for your point or for my point... ^^ Anyways... Maybe it's a corner case. Fine. Not the worst one I've ever seen.
> I know, it's a pretty revolutionary idea. So I'll just say it again: the user is the one who chooses what their computer does.
That's obviously just the 2nd part of the story. At least so far. In some years, sure, every user (of FOSS software at least) can vibecode her own creepy set of features...
> It's a fantastic way to preview videos.
What you describe sounds exactly like what I would do, but I would start Dolphin instead. It's another shortcut for closing it. That's it. On the other hand: Here I can start arbitrary applications. For a LO-spreadsheet, LO would start! For a Blender model, Blender would start! VLC starts so quickly, and can read any remotely valid video file. I still don't really understand what I'm missing tbh...
> I also have a custom command_not_found_handle which displays a randomly-chosen animated gif from a list
Well, okay, that's far away from my taste how a system should behave... Maybe I'm just too old... ^^