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.
Wouldn't that return us back to class restricitive gameplay? Meaning, for example, instead of upgrading the before mentioned Ranger's "Way of The Ranger" asap, we'll now have to upgrade Ranger's primary stat - Dexterity asap to get all those powerful ranger skills early on. People will certainly want those skills, even if they will have fewer slots for them. That means we will still have very specialized minmaxed characters.
I think level restriction is better, because it means more relaxed gameplay - players won't have to dump all their points into one thing to get those desired skills faster. They will be more prone to experimentations, knowing that at higher levels further down the road they will get new, more powerful skills, so there're no need to rush for them now.
So I say - leave it as it is, it's good enough as it is.
