The ability to turn a thin bowl e.g. to a few mill, is something most turners try, same with hollow forms. For decorative work perhaps it is OK and if you aim to pierce it is essential but for practical use the bowl needs to be thkick enough to use. Perhaps those who like thin bowls are trying unwittingly to achieve a porcelain type feel? End of the day the piece needs to be fit for purpose so the type of wood, design. shape and the thickness are all important factors and should be dictated to by the personal taste and, as said, the eventual purpose of the piece.
Pete