How we progress in ffxiv will not be labeled with exp. points and level. Your progression will be labeled by your weapon, armor and craft progression. People will still be in full parties, small groups and even solo. The more you use one type set of weapon, armor and/or craft the more paths will unlock for that certain weapon, armor tree. Crafting, more the same, if you start as a culinary u decide to stick with making juices and fruit base foods the more recipes for that specified area will unlock for the cooker. Same if you decide to go with meat based foods, fish, bread, pasta. With all the info released, this is the speculation for the majority of us.