The classes/rols/jobs/whatever were broken down from the original version. For example in the case of Duelist. The old list would have placed the Gateway, Ganker, and Duelist units all under Duelist. It was a role that was given a 6+ number with most people picking around 9 total normally. In this list. Duelist are well units that can fight a strong target 1v1, but normally will require outside help from a healer. A ganker would be a unit that could be dropped anywhere and fight, survive, and kill their target alone with no outside help, but generally they wouldn't be able to take the stronger foes a duelist would. They also normally have some form of self-healing or can't be healed at all, or have little impact on your UP when used. Gateway well being units you can choose to have block or not... something that apparently I actually need to update since it seem some Ninja now hit this role due to some update in DMM.
Right now the roles are really broken into any specific order. Though in the final version I'm proper going to keep previously connected groups together.
The goddess of luck has graced the thread D:
Many units are suppose to cover multiple roles. As well that is what they do in Aigis or at least can do in Aigis.
As for all units being included. Well they were meant to be. As oppose to the old list who had things sorted by classes in general. when units of those classes don't always do what their class generally does. What you ask though can be included as a... cover page(?) I want to say. Either way the final product would be much more readable and friendly then this. Since you aren't the only person who has asked for roles/classes/jobs to be given a written out definition.
This is more of a way for me to edit this together easier. Something like this. Not exactly, but I guess it gives an idea.