Ok, so, yeah, we all point at SMN/SCH as the textbook reason not to combo jobs, but, would they be less problematic if the supposed jobs were of the same role? The balancing problems of SMN/SCH are largely due to the dps/healer schism.

And, now that they're aware of the problems common to such a system, maybe they'd have a better chance to future-proof any base classes.

Of course, that requires more work and effort and time and money, when they could just skip the depth and complexity and jump straight to the jobs people actually want.