I agree, do you?

Today, exceptionally, I am in good company:

Once upon a time, a great application was defined by the functionality it provided. Then, over time, the ease of use of an application became important—it wasn’t enough just to get the job done, it had to be easy to do so. In the last few years, the bar has been raised again. Now, a truly great application isn’t just defined by its features and how easy it is to use them, it’s also defined by how enjoyable it is to use.

source: Apple Developer Connection
Let me add (and distort): difficult things are funny! Do you enjoy correcting the phase of a 2D spectrum?