To expand on this topic a bit more, even though it's not recommended and outside the scope of one's roles, players being able to make use of their tool kits to their utmost efficiency and providing clutch recoveries is what differentiates a good player from an exceptional players.
Good players know their roles and execute them passably and get the job done. It might not be the most efficient / fastest / effective means, but there were no serious hiccups or derpy moves made.
The exceptional players are those who make use of their tool kit and can adapt quickly to unexpected and ever changing situations that arise from any encounter. These are the players who can make clutch wins happen, who knows how to pick up the slack if someone else falls, who can counter balance the mistake of someone else if push comes to shove. These are the players who understand their role, play it to its maximum potential in that role, and then exceed that role by completing tasks that are not normally tasked to them while maintaining their efficiency or preventing a catastrophe from hitting the party.
I wish there was more exceptional players out there though, but I guess that's why they are that: 'exceptional'. At one point in time during a DF HM Ifrit, we had a non-AoE LB setup given and we decided to give it a shot. After two wipes on the nails, we worked on ordering and who was Limit Breaking where and which target, as well as getting added DPS from one of the healers to help burn down the nails. Lo and behold, success! But then, right on the first set of eruptions, our OTs Stun gets resisted and then promptly gets exploded in the face along with the rest of the party except for myself and MT. We're at two and a half bars of LB and I figure in my head if the MT continues to stun, we'll get up to LB3 and I can wipe recovery the party with my LB3.
...the MT doesn't stun, just continues to build hate nonchalantly and doesn't stun at all. He literally eats the next set of eruptions and I can only heal so much while trying to dodge eruptions myself. He eventually dies and we wipe.
It's situations like these where experts play up and beyond your role can lead to clutch wins and victories and I wish more players had the capacity to understand their tool kit beyond their designated role.
Oh well.