They are perfectly aware of which stat benefits which job. Look at SCH books for example. All of them are crappy, except the High Allagan ones. Most HA weapons have the right stats for the job.

So yes, secondary stats is how they "Balance" weapons right now. They are all i100 or i110 with minor differences, but one is clearly superior because it has the right stats. They put SS on any kind of weapon they deem should be inferior.