classes should be able to take on mutliple roles. Jobs are used/needed when a task is given to a player and the job she/he uses only does that one things none else, classes on the other hand would be more flexible.

With SE fixing/adjusting the class-jobs system, classes will eventually have mutliple jobs branched from them. Example Gla class, pld and drk jobs. Gla can tank with shield and sword (double attack for lil more dps and enimty build) or it can heavy dd with great sword or doublehand a one handed blade to be dd. the key to this would be fighting stance, that being said offense and defense stances. gla tanks while in defense stance or it can dd when in offense stance. pld will always be in defensive stance and only tanks, drk on the other hand will always be offensive stance and only heavy dd's and they do this because they are jobs not classes. gla class can do both(tank & dd) but to a lesser degree because it can change its fighting stance and the jobs cant.

the same would go for other class like mrd. mrd class, can tank by high hp and parry rate with great axe in defensive stance or it can heavy dd with a war hammer (maybe) in offensive stance. warrior job tanks via high hp and high parry rate using great axe in defensive stance and berseker job heavy dd's with war hammer in offensive stance. mrd class can do both of these roles but again to a lesser degree because it can switch its fighting stance and the jobs cant.