The way i imagine the difference would be that by branching the job from a certain class there must be a lock in the skills the job can use from that class right now the jobs are using every skill because theres a relation of 1-1 but suposing a red mage will branch from thaumaturge maybe will be able to use first 2 tiers of every magic the thm has but redmage will add bio poison refresh cure and a poisona and a few gld skills at the end this job will feel a lot different from the rest