Not to mention what the prequels have to say on the colonization front.
But the infancy can be a longer period of history, things can be moving slowly and having ups and downs. With a great venture like space colonization, I would get that things can move slowly, a century of work can still be the early phase as a whole, even though individual cases can vary wildly, from prosperous to a extremely hard life on a planet. And the prototype phase can mean that no planet as a whole has been settled yet, only isolated colony settlements, being few in number and not of a huge size when you consider that you have a whole planet to yourself.