Vanilla Essence is an essential ingredient in any kitchen. In the local context, we are more familiar with the liquid than the powder. There are instances where the vanilla powder can be an excellent choice in use.
Water sensitive recipes like meringue and kisses where a small amount of liquid can decide success or failure of the final product.
Products cooked at high heat for a long time. Liquid flavours are heat sensitive and tend to evapourate at high heat. The vanilla powder would retain the flavor better.
Colour conscious recipes. The usual liquid vanilla flavor is brown in colour. Suppose you are aiming for a wedding white frosting the vanilla powder which is a whitish powder can contribute towards your goal.