Black and white UI kit is an attempt to make a minimalistic design. The beauty of restricting yourself to black and white has similar benefits to the style of minimalism. When color is stripped out, other design elements such as form and texture come to the forefront. Avoiding color is also a great way to quickly improve as a designer because you'll no longer be able to lean on your color pallet for visual interest.
Black and white UI kit is an attempt to make a minimalistic design. The beauty of restricting yourself to black and white has similar benefits to the style of minimalism. When color is stripped out, other design elements such as form and texture come to the forefront. Avoiding color is also a great way to quickly improve as a designer because you'll no longer be able to lean on your color pallet for visual interest.