Swirling aerates the wine, allowing it to enter in to contact with oxygen, thus releasing aromas.
It is true that wine can certainly be drunk and swallowed without paying much attention. Much of using perceive as taste is simply by smell, gives is a vital point component in tasting wine. https://stewplant7.bloggersdelight.dk/2024/06/05/how-to-get-wine-affordably/