What is the point? To allow players to play a caster whos power comes from innate ability and talent rather than conviction in a deity or set of principles (cleric), a connection to the power of the natural world (druid), or from long and arduous study (wizard).
From a meta perspective, they are, at least in my experience, significantly easier to just pick up and play compared to a wizard.
These are my spells, there are many like them, but these ones are mine.