IKEA assembly is trivial for most humans. But that is not the point of the article. The point of the article is that it is non-trivial for humans to make robot

IKEA assembly is trivial for most humans. But that is not the point of the article. The point of the article is that it is non-trivial for humans to make robots able to do what they can do easily themselves. The IKEA task was likely chosen because it is something many people have personal experience with, which makes for better public understanding and engagement with the underlying engineering work being displayed.