He takes his time.
There are several important things that happen in Baerlon specifically: Rand's Channeling sickness, meeting Min Farshaw (who ends up being the #7 viewpoint character by word count in the series, the most of anyone other than the Villagers and Moraine), the initiation of a feud with the Borneholds.
The Shade scene is amazing just for the sense of atmosphere in the prose and the milk spit double take that Rand does. The encounters with dark forces in this book are a drip drip form of torture driving the characters to desperation and near insanity by the end. The show moves a bit too fast to get that across, it seems.
The main thing that Baerlon specifically provides over the course of the book is a sense of scale. It's about 50-60 miles from Edmond's Field, and is bout the extent of the distance the youths can even imagine geographically, but us just the start of this journey, which gets detailed out very carefully. No flash forwards here.