What many people generally don’t understand about Mozart and, in general, “pretty” music, harmonious passages, is the amount of energy it can take to write them. They believe that when the music is dramatic the idea and passion and work behind it is dramatic, and an idyll flows just like that, easily, from the mind of the (not very interesting) god which they listen to. “His (or her) music is only pretty. How nice to listen to.”
But to bring together things that absolutely don’t fit together, that is one explanation why harmony can be as interesting as the opposite. Conflicts that become resolved, not left open.
It sounds easy, maybe, when you have done all the work and gone through all the trouble that is needed to state the final point clearly and neatly.
Of course it may happen as a composer or an artist that you make things easily, but then it is usually a result of work during a long period of time, or maybe an outcome of life in an equally long period, with troubles that suddenly find a solution. If you are tense, it usually has a reason and has to be put somewhere. An Austrian I once met said, jokingly, that Mozart must have been on some kind of drugs. Mozart’s music is usually flowing over with energy.
Probably he didn’t need the drugs, it came naturally.
Also, if you play some music and don’t find it that interesting, you might just not have got to the point of that specific piece. Maybe you can’t hear that there is a conflict there at all.
Maybe there is art with no conflict, too, but I don’t think that’s the general rule.
The difference between two pieces of music is anyway the outcome, the result, the solution to your artistic or personal problem or both, what comes out.
Double and triple meanings is also an obvious thing to consider when you listen.
Where you land your music or your art in general, as an artist, depends on many things, I guess. Where you want it to land, whether you need to make something harmonious or not, and your background in this respect, both professionally and personally.
Do you like a happy ending? 😉