CC has counter tools to keep track of samurais with charged LB on the party list. AoE can still fuck you up real bad when you're playing an AoE job though, but otherwise it's manageable without much issue (unless the shitty tab targeting really wants you dead in the heat of the moment).

FLs is problematic in that you cannot reliably track samurais (marks help somewhat, but then it becomes actually funky when you notice that every time you're trying to AoE the enemy, there is at least one SAM in the middle lol), and AoE application is even more important in that mode. If you have a personal shield, try to keep it up as much as possible when you're applying damage I guess, even though that's a luxury not every job has going for them.