Wallpapering can be a practical and more visually pleasing alternative to painting and also old wallpapering can be nuisance to remove and needs removal when applying new wallpapering. Painting over old wallpaper would not leave a good foundation and pattern. Also all cracks, borders or bubbles would still be visible. By removing old wallpaper before replacing with a new on for it can give more professional appearance.
Wallpaper adds life and texture to plain walls and may suit your needs better than paint. There are countless patterns, fabrics and designs available for you.