If I recall correctly from other people, Fo/Fi can be the strongest Fo class combination out there now that they added T-ATK to the slayer skills and Tech Arts JA, but it's still much more conditional. This is purely off vague memory, since I'm too lazy to do the math now.
Also, Fo/Br is used not only because of access to Banishing Arrow, but because Weak Stance applies to elemental weakpoints as well, so it's much easier to work with than the conditions needed to dish out maximum damage as a Fo/Fi. Also, Fo/Br doesn't spam the same tech over and over again, since their damage comes from matching elements. Of course, some techs shine over others within specific elements, but it's not like LOLILMEGIDMASTERRACE back in the days. So it's not as mindless as you make it out to be.
Zondeel + Wise Stance wouldn't really work the way you think it would, since Fi stances rely on your position relative to the enemies'. If a scenario like how you described did turn up, then the only 2 outcomes would be Wise Stance wouldn't apply at all since you're right in the middle and the mobs are facing you (or at least I think it wouldn't), or it would only apply to half of the enemies if you were even remotely off the middle.
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