Has SE screwed itself?

[Sylve]

snip

You still haven't given a convincing argument on why Jobs should be a priority over Classes because of 'casuals'.
I have friends who only play a few hours on weekends, both have one class at 50, and are currently working on multiple new classes.

We do agree at least in part, that some Classes could get alt role Jobs, But some classes, In my honest opinion, should not. PGL, LNC, CNJ being notable ones. Giving a DPS Job to Marauder is fine, they can just use DRG style gear with tweaked traits/skills, thats fine.
But a Tank Job for PGLs? Please no! They would be required to either wear heavier gear (which goes directly against the PGL lore), or have weird percentile buffs to make them on par with the existing Tank classes, which as seen in many other MMOs, leads to massive overscaling/underscaling and in some cases, breaks boss encounters.

Another reason I'm wary of giving certain Classes some of the Jobs found in previous titles, is the weapon they use. So far, all 9 Jobs continue to use the weapon the base class is built around, as well as the core spells/skills, even the SMN/SCH as you pointed out use the same spells when healing isn't intensive.
If a new Job's iconic weapon is NOT the same as the class it's coming from, Then how do you switch to it? Equip the weapon? But its the Soul Crystal giving the class the Job, So you equip the Crystal? Now the weapon is wrong!
Even the SCH can be a little weird in sub 30 Dungeons, they just become ACNs with a Fairy.
So this again limits which Jobs can be applied to existing classes, as we currently have no changes to equipable weapons when moving from Class to Job.
I do believe Yoshi at one stage pointed out that Classes were better suited to solo play with the wider cross class pool, where Jobs were more specialized and better utilized in organized play (Parties etc).

Jobs aren't actually any easier to create than Classes, because to create a new Job for an existing class, they would need to first pick a Job that is similar to the class it's coming from, modify all the existing skills for the new Role, then add new Job specific skills and then create a story for the Job to work through and gain its Job skills from.
From what I've seen of the Class/Job structure, the ACN was built from the ground up to have 2 Jobs. None of the other Classes were built that way. The CNJ is a prime example of that, given how many of the skills learned are straight up Healing spells.

I would very much like to see more multi-job classes, If only because i like variety.
But i do very much feel that any multi-job classes should be created new, from scratch, to be multi-job, the way the ACN was.