I like the idea of party servers for a couple of reasons and perhaps there should be alternatives among them, like one duo and one for three players?

A) Being a Shai I want to group up eventually but unless it's a spot for 3 or more I feel (and probably am) more like a burden than an asset which kinda sucks as Shai is supposed to be a support. Sure, once I get really good gear people want me for Olun but that's a loooong way to go.
B) As a Shai, some places are just off-limits (Stars End for example) since I can't defend myself against other classes and literally everyone knows that, meaning I end up being fed to monsters through various types of CCs by other players.
C) Sometimes I want to solo grind, sometimes I want to play with friends. Giving the players the option to group up without going to Mirumok (if you're "low" AP/DP) and just farm things would be a fun addition while also not forcing people to play in groups.

I like the idea of those group spots giving more XP but I believe it should only be a slight boost as to not make it feel mandatory. One thing I love about this game is that I don't have to group up or join a zerg in order to get (most) things done.