Mechanics books always highlight that the main advantage of bearings is to reduce friction, especially when we talk about them in rotational motion applications. The example of ball bearings is always mentioned. The balls prevent and regulate the contact between the inner and the outer rings in which they reduce the friction between the two.
Would that be the main philosophy behind bearings? If that is true, then would not be better off just to remove the whole setup and have the axis of rotation free from bearings so that there are not any inner or outers rings and therefore the friction problem would be removed from the beginning?
However, I always see that the friction treatment is secondary to a main purpose of bearings ( that I have not realized yet ). Should not be there a more fundamental reason of bearings?