It's in part about time
How much time do you have as a GM to prepare? How much time does the group have to play? And what do you want to focus you prep time and your play time doing?
For example, I use to run a Yoon-Suin game and the party had to travel far to explore this rather large dungeon due to a dire prophecy. The trip there was 6 weeks - big journey!. So I had a number of encounters of all kinds on the way - a troll inkeeper, brigands, local politics, an oracle, rival priest etc etc on the way. But we only play 3 hours every 2 weeks. After a few sessions, we were still not at the dungeon yet!
So we just skipped ahead the rest of the way.