The problem is not the limited flying hours the FO's have, but it depends on their training and their own abilities and ambition to fly manually. I saw young FO's (500 hours experience) fly raw data (TO, cruise, approach, landing) better than their captains (with over 10 000 hours of experience).
So the argument that young pilots need to be in the jumpseat, for the development of their flying skills, is total crap. They need a captain ( and a company) who allows them to fly manually.