Those features help them walk across desert sands.
So that they are able to walk across sand without sinking in.
The width also helps spread the heat of the sand across a larger area of the hoof.
To walk on sand
so they have a bigger surface area to handle their weight and the objects that are put on it to carry - so they don't sink into the sand
To spread their weight out over the sand, which helps to prevent them from sinking in to it. Camels are adapted to walk long distances in deserts, hence, they have evolved to form large, broad, flat feet. More surface area means less pressure exerted on that surface, and vice-versa as the pressure is distributed on a large area.
because it would give less pressure on the sand which prevents it from sinking