If it's always giving people experience for the future, then you're likely not sending the strongest team and therefore really not fighting for the medals as you potentially could be. Sam's a wildcard, but like mentioned up-thread: he's very likely to only be used in two events, one of which is floor exercise. He had the big scores in those two events, and he earned his ticket.
Gymnastics, much like skating, is unpredictable. It's impossible to know where any of these guys will be in 3 years, and what the up-and-coming talent is capable of and how they will progress.