Why do many Ayurvedic and traditional recipes use dry ginger (Sonth) instead of fresh ginger?

In traditional Indian households and Ayurveda, dry ginger (Sonth) has long been valued as a distinct ingredient rather than merely a substitute for fresh ginger. It is commonly used in herbal preparations, kadhas, digestive recipes, winter beverages, and spice blends due to its concentrated flavour and warming nature.