The enemies will start using a wider array of different spells, we didn't want to make the early fights too hard. They should also not use too many things you cannot counter and vice versa.
Removing the level requirement does not mean you will be able to learn Meteor Strike from the get-go. If that has INT requirement 13 or something, it's still a late-game spell.
And if there are multiple skills to choose from at the start of the game, with e.g. INT requirement 8, then it's up to you which one to pick, because your amount of slots is limited. I think that gives more choice.
