Larian should really implement this feat as intended, or at least as the Rules Sage Crawford said it was intended to work. If they did, if the character has spell slots, they should also be able to use those spell slots to cast the 1st level spell that was chosen, in addition to be able to cast it once per day for free. This would greatly increase its utility for the classes that have have a only a few known spells such as the Sorcerer, Warlock, Arcane Trickster, Eldritch Knight, etc.