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Honestly, the only good I see from not upgrading to the implied job is that you get to equip ten cross-class abilities (at level 50) instead of five, and you can choose cross class skills from any class instead of two.
It's important to note that it's very, very rare for the expanded list of cross-class abilities to outdo the job abilities in value. The jobs still get the significant majority of valuable cross-class options; there's usually maybe one or two they lose out on total. By comparison, the techniques from your Job, plus the stat boost and equipment access, is extremely valuable.