when XIV came out I was having a solo streak in XI so I argued for the game to be soloable. I don't think that was the right mind set. I want casual content and the option of hardcore content. Having levequests and behest is a great example. using these methods I can level on my own if I wish but there is the option to team up with 3 other people or 7 if I chose.

as for quests there's no reason there can't be easy ones and hard ones. in other MMOs there are quests that have suggested player size and some you can solo. This is another thing that can meet both play styles. main story is where some will but head. I don't think I'll see the main story in XI because I can't find people to do it or there are people who can but don't want to go through it again.

right now you can solo through the storyline and I'm sure they'll add harder missions along the way but maybe add a difficulty system so you can go in a smaller group. these are my ideas and I hope they help the game in some way.