Someone please explain the logic...

[Wicc]

Its a balance.
You can have too little ACC and also too much ACC (As in, points are not in other stats instead)
They don't expect you to get a full set of one type of item (weathered...crafted..ect), but mix and match (Ever notice that best in slot complete set was NEVER all Myth or all Allagan pre patch?)
There is a mixture of both for best in slot, which in the end will make your acc where you need it to be.

[Moirear]

Its a balance.
You can have too little ACC and also too much ACC (As in, points are not in other stats instead)
They don't expect you to get a full set of one type of item (weathered...crafted..ect), but mix and match (Ever notice that best in slot complete set was NEVER all Myth or all Allagan pre patch?)
There is a mixture of both for best in slot, which in the end will make your acc where you need it to be.

I think it's the opposite of balance: some jobs can easily gear up with any combination of myth/soldiery and coil drop gear and have sufficient accuracy, others notoriously always have too much or too little and need weirdly specific combinations. One of the most glaring examples is PLD versus WAR, but there's also DRG versus MNK, or SMN versus BLM. And let's not forget how stats in Crit or Spell Speed are weighted for SCH versus WHM. Oh look, I almost counted up all the jobs there are.