It also lasts longer as it contains less oil. For these reasons, consumer preferences favour white rice as a whole food and also as a component of manufactured foods. Milled rice and polished rice are both white rice. That is, rice that has had the germ and bran layers removed via a process of brushing the rice kernels. If it's simply milled that means the aleurone layer is still intact.
White rice is nutritionally inferior to brown rice.
Efforts have been made to retain the desired properties of white rice, without sacrificing nutrients. One technique is to par-boil brown rice to lock in the nutrients prior to milling.