The Galileo was at the threshold where composites would have been more costly in time and effort than a practical prop. The facility and quality of composites has also improved tremendously since then.
Oh, you mean the threshold in mockup size, not the temporal turning point in technology, right? Because I was going to object.
So the Eagle and Firefly were on one side of the threshold, while the X-wing and Viper were on the other.