But see, sebum is not a moisturizer either though, and like jojoba it is a actually a wax. Sebum is a coating for the hair shaft and skin
to protect the hair/skin against moisture loss. It is only meant to waterproof the hair, because what use would it be as a protectant to penetrate? Without it, any moisture we retain would evaporate into the air and we'd be forever dried out. Again, moisturization is ONLY a characteristic of WATER. H2O . Hydration=Moisturization, and you can only hydrate something with water.
Oils repel water, even jojoba and sebum. Softness, shine, and pliablility are characteristics of moisturized hair, and oil can definitely accomplish this for you--but that still is not moisture. Penetration does not equal moisturization either.
Lots of things can penetrate the hair (especially damaged or porous hair)-- some proteins, relaxers, color chemicals all penetrate and none of those are moisturizing the hair.
You don't have to use a daily moisturizer per se' to keep the hair moisturized. In fact, I think the best moisturizing is done via your deep conditioning process. When you deep condition, true moisture is able to be asborbed deep to the cortical layers of the hair. Anything you apply after that is helping your hair retain that hydration source. Daily moisturizers help keep moisture levels up if you need extra along the way. I know y'all are tired of me saying this, but oils simply do not moisturize. It is not their chemical nature.
If any of you get a chance, please check out a book by John Halal called
Hair Structure and Chemistry Simplified. I strongly encourage you to read this. Amazon has it for about $40 something bucks. You can read all about moisturization for the hair, and the chemical actions of oils. It is a science book, but it is very easy to read.