So if I make a mistake I have to get up? Way to be an Apple apologist.
It's bad UX design because it's not intuitive. Many users have no idea it's even a thing. It doesn't work consistently when you shake it. In some apps it doesn't work, while in others it has been replaced by a button. Even Apple's own Notes app uses buttons in addition to the shake. Sometimes it is invoked accidentally while walking or riding in a car or bus and things are bumping around. I do UI/UX for my job. I know what I'm talking about. And yes, everything you're talking about is an example of UX design. I'm not sure you know what these words mean. UX means User eXperience. UI means User Interface. To say that something is an example of UX design does not denote a positive or negative connotation.