I think both systems have goods and bads.
XI: I am tagged as LFG, I sit here the whole day because I am not a very initiative person, and I don't like asking everyone out there and wait for 10min to get reply; and when I want to find a group, I don't know where the groups are or if there's any group that's looking for a job that I have. But, people can find me easily because my tag is up!
XIV: I log on, first thing, is there any group out there and yay there's a list of 4 groups recruiting, join and have fun. Problem, I wish people can let me know there's a group that formed in the last 5 min when I am crafting for the last 15min...I don't close my craft window to check if there's a group that might want me or a group that I want after every craft. Since I am not a very initiative person, I don't put myself in the recruiting list.
Conclusion, if there can be both...it would be awesome for a lazy person like me^^