Question about Tank stats

[Noxifer]

Can still allocate to VIT as a DPS/Healer to meet HP thresholds, though.

True. Though we'd still be able to do that through materia (if necessary) if stats were auto-allocated.

Also the whole MND/INT split for SCH/SMN.

I... have to say that this is actually an argument against stat allocation. If they had stats auto-allocated, they could adjust the MND/INT balance depending on which job you had active. They wouldn't have to be class-based, but could be baked into the "bonus" to stats you get from the job stone.
(Speaking of which, I wonder how they solved that with the new jobs... Did they assign those three jobs a "dummy class" that's never applicable, but still manages to keep track of point allocation?)