Gouache has properties different to both acrylic paint and watercolours, allowing a different style of painting.
Acrylic paint has a shiny, glossy appearance and can be applied thickly to create surface textures, while gouache is soft and flat, drying flat and matte where it can't be watered down to look translucent such as watercolours (Skillshare Blog, 2021).
This gives the painter different opportunities where it is ideal for action and gestural paintings, as seen in the videos below.