The wording on this feat is a little wonky - it makes perfect sense for Oracles and Sorcerers, who are limited by the number of Level 0 spells they know. It adds another 2 L0 spells for them to cast an infinite number of times per day.
But what do you do when you get to Clerics and Wizards, who already know all L0 spells by default? Are they, RAI, allowed to prepare another two L0 spells each day if they take this feat?
Not much benefit for clerics or wizards, although there are some "rare" cantrips they don't automatically know.
Refer to this blog here for some examples.
So a wizard or cleric might want to learn two of those. Technically, a wizard could learn them any time he leveled up too, but why waste that opportunity to learn higher level spells?
Of course, Oracles and Sorcerers are the big winner because they learn two new cantrips/orisons AND they can cast them forever without having to forget two others.