I wouldn't mind if they were long, but they're a lot shorter too. Nations like the Netherlands could easily have massive speals about how they ventured out across the seas, "Expanding their kingdom, discovering new people and great riches in faraway lands" to quote the original opening cinematic. It'd be much cooler to hear about the empire as well, but for whatever reason they've gone leader.
Maybe it's scoping out for multiple leader civs in the future, seeing as they're also putting more emphasis on the leaders this time (Casimir III of Poland, Pedro II of Brazil etc. instead of Carthage, Byzantium etc.)