How is this any different than “just list yourself/your group and wait”? Why would you sit in a city with RDF but not LFG? I don’t understand. Especially when RDF ports you to the dungeon and back out where you left. So if you’re doing a daily or fishing, you’re right back at it.
That’s certainly a personal preference and you’re free to disregard RDF entirely if you choose. No one’s going to fault you for playing how you like.