I feel it's fine in your scenario. The cases where I feel a player really shouldn't are largely when it's their first job and they really need to learn to play period before jumping into high level stuff. If it's your second job or later, who really cares. I will say though: I do feel getting the abilities one by one does help with learning how the class works, but you can always do the same thing I do every time an expansion drop and my entire kit changes anyway: Go to a dummy and add skills one by one, experimenting with it and learning how it functions before moving onto the next.