Given that there can only be a given amount of new content added to the game with each expansion SOE needs to look at ways to make it rewarding to it's playerbase to at least dabble in the three fundamentally different content types that players seek out.Those are solo, group, and raid.
There is a pile of solo content in EQ2. The number of solo quests in RoK was almost staggering and they have added few more in TSO and usually add a few quests here and there with events. The biggest issue with solo quest content is that it is usually not repeatable, except for the writ system, and people are stuck in the mindset that solo content=questing. Because of this, there can never be enough solo content added to a game to satisfy a solo oriented player with a medium playtime.There are a load of new areas filled to bursting with solo mobs in the new expansion but unless a solo player has a quest to explore the area and kill the mobs there they aren't interested.
Until the release of TSO the amount of group content was lacking. People ran the same few instances over and over and over because that was the only choice. Now there is a bonanza of group instances to choose from. Some have asked for shared dungeons but let's be serious, the only time 95% of the people visited these dungeons was to work on their epic questlines or to do a full runt-hrough once in order to kill all the named for AA. Other then that, or people enroute to raids/instances, they were empty.
There is a pretty decent raid progression in EQ2 atm with the casual playerbase being able to dabble in the RoK T1 content, and the more serious raid people progressing further into the content.
Okay, that being said, let's look at what content is offered to it's playerbase.
Solo oriented player. Possible to level 1-80 never grouping with another individual and probably get your AAs to a decent level (170ish) at the same time. The gear from these questlines will allow you to do the easier group, and raid content if you choose. Solo players still have the advantage because it is possible to get the max level and get a load of AA points playing there preferred playstyle exclusively.
Group oriented player. Pretty much forced to do solo questlines for a significant period of leveling since they offer good AA progression which are essential for doing level 80 group content. The gear from the solo quests that they need to complete and from the group instances give them a decent leg up into the raid content if they wish to raid casually. Most groups want reasonably challenging content so if it was made so a group of 3 or 4 people could do it, it would make it trivial for full balanced groups.
Raid oriented player. Same as the group preferred player since they need the AAs as much or even more. They also will do group content for a few "golden egg" drops that help fill their raid gear sets.
Basically the only playstyle that has a true choice to only play the game the way they most enjoy it is the solo player. They can gear up to a level that will make them successful for their content niche, can acheive max leve, and get a load of AAs. Perhaps they should put together a load of solo instances together with named in them that will drop a ornate 10% of the time, fabled 1% of the time, and you could get a partial shard for completion (maybe 1/4 of a shard that could be combined to make full shards).