No one needs anything aside from water, food, and shelter. It will all depend on the type of music you intend to play. A metal guitarist, for example, will be more likely to 'need' a 24 fret guitar as there are far more high pitched runs in this style of music than in others like country. If, inversely, you are simply wanting a guitar to strum along to some songs, then a 24 fret guitar might even be too much for your purposes.