I do feel the impact of fatigue of captains continually flying with inexperience FO's may have some affect on flight safety, please correct me if I'm wrong those captains who do not feel this way I will be more than happy to stand corrected.
Not necessarily, most of the "inexperienced" are young and enjoy their social status. As a result they take a nap on every other sector which leaves the skipper with an hour or so of undisturbed, peacefull cruising through the skies. Priceless.