It always amazes me how even just regular every day users will come to me with something like this:
Overly simplified example:
"Can you make this button do X?" where the existing button in so many ways is only distantly connected to X. And then they get stuck on the idea that THAT button has to be where the thing happens, and they stick with it even if you explain that the usual function of that button is Y.
I simplified it saying button, but this applies to processes and other things. I think users sometimes think picking a common thing, button or process that sort of does what they want is the right entry point to discuss changes and maybe they think that somehow saves time / developer effort. Where in reality, just a new button is in fact an easier and less risky place to start.
I didn't say that very well, but I wonder if that plays a part in the endless adding of complexity to UI where users grasp onto a given button, function, or process and "just" want to alter it a little ... and it never ends until it all breaks down.