A shorter minimum focal length allows you to get more of the scene in the photo, and offers a wider angle of view than longer focal lengths.
We consider a lower weight better because lighter devices are more comfortable to carry. A lower weight is also an advantage for home appliances, as it makes transportation easier, and for many other types of products.
A longer maximum focal length allows you to focus in on a small part of a scene, and offers a narrower angle of view than shorter focal lengths.
The device is protected with extra seals to prevent failures caused by dust, raindrops, and water splashes.
A prime lens has a fixed focal length. In general, these are sharper, with a wider aperture.