The antisocial behavior of leves I do not see it much, usually when someone ask to party up on my server they get into a party. If anything the leves where designed to be extremely social even the party recruit feature and teleport system was designed to allow for ease of group for both those with limited and longer playtimes.

The problem is the community is not being social. My linkshell does all leves in house as well, but it is not because of failing the leves to maximize sp or not wanting to play with others. It is out of necessity because people simply refuse to use the search feature to look for a party and just solo everything, so a linkshell centered event schedule where everyone in it gets on and does leves at once guarantees us the ability to party (the only way in my opinion to enjoy the game).

The biggest complaint atm in my linkshell is not lack of content honestly it is lack of partys, but unfortunately I see this as a problem square can't fix it is something the community needs to address, if everyone used the search/recruit feature the game would no longer be anti-social. The only way SE would be able to fix the party problem is to require leve to have 3 people to start or drop all solo sp by 75% and make it like FFXI... both those would cause a mass exodus of casual players though.