The first method, where the bowl is held directly, is still physically possible and may feel more natural in casual situations, but it can warm the contents more quickly and leave fingerprints on the glass.
The second method provides a cleaner and more controlled way to handle a stemmed glass.
The main lesson of the image is simple: hold a stemmed wine glass gently by the stem rather than wrapping your hand around the bowl, especially in formal dining or tasting situations.
