Pretty much, unless you're looking to full clear every mission/collect a few extra FGs.

Actually, now that we have 5 or 6 missions and several world zones, it's over half an 11 pull to complete them all as a reward ATM.
Granted you actually need the units from every zone to be able to clear the missions, so not totally accessible to new players as a source of FGs but for some veteran players with extra stamina to spare there's enough content there to be worth doing.