Most modern people prefer practical and concise UI design. Simple design can be pleasing to the eye, because it allows users to read the above information faster, which is why flattening is popular.

But in fact, "simplicity" does not simply mean "less". To be precise, "simple" should be "just right". But maybe this statement itself is too simple. In some cases, we may need to go through more things to realize the simplicity of design. Therefore, a more accurate definition should be "just enough to make people have a correct understanding and accomplish their goals through corresponding actions".