My concerns about a "worldless model" what are yours?

[Andrien]

Is that not what the Search function is for? It works wonders for me when I use it for this. The annoying part is that many people who are listed as seeking party are actually AFK, so perhaps the system would work slightly better if those who were AFK for, say, 5-10 minutes were listed as idle instead of "seeking party".

Not sure if you meant exp party, but from what I understand, the party finder system is aimed for dungeons/instance, and not primarily for open world EXP party.