Dang, I can really feel Alexa disintegrating my emoji with this one.
This is a semantic point on the whole "not everything has to have a deeper meaning chain", since I agree that small side-beats can add a lot to something.
The fact that we like these things and think they make something better indicates that they serve a purpose ("serve" rather than "have", it doesn't really matter if the author was deliberately considering the benefits so long as they ultimately exist). They don't contribute directly to the main plot, but they clearly contribute something.