This is like saying that going to restaurants does not allow your talent to shine in cooking.

Every person decides what to do with their saved time. Some people may want to use a ready made game, others may prefer to write a story or alter the script of the game. The ones who play a ready made game may express their creativity in areas not related to gaming.

You are judging people for not doing what you think they should do. As if your role was to be their social engineer.