In no way have I considered myself superior to anyone in any part of my post. I simply made point that you are a warrior of light, as in most Final Fantasy games. A warrior infused with the light of the crystal....and can't beat Twintania? Now, usually when I see a thread similar to this, it doesn't come down to the specific player's skill. It's more so their willingness to form a party/static and taking a leading role. It's quite common for people to be a little unsure or hesitant to tell someone in a party "Sorry, but we just can't do this with you." because it seems that when someone tries to convey such a truth, they are branded an elitist, even if they are trying to be as polite as possible. When this occurs, it seems more common for the party to just disband instead of dismissing the player until they are ready.
On top of that, T5 has been out for a very long time. There are numerous resources when it comes to learning the mechanics. As for DPS checks, healing, tanking, HP requirements etc., it's quite difficult to not meet these with how accessible i90 gear has become and beyond that with also the echo buff stacked on. Again, the only issue is mechanics.
A common argument to this is that people do not have the time to work and play enough to learn the mechanics, but if a player has been playing since launch and still hasn't beaten T5 and is using the same excuse, how much have they tried to learn? How many videos have they watched? How many questions have they asked to a player of a similar role?
Going into any fight and wiping time and time again is simply not enough to learn. While players may experience the fight, they won't necessarily understand the mechanics and why or how something happens and that's wherein the issue lies. On top of that, if a player comes in with little to no knowledge, as I have seen happen, it means at least 7 people having to spend their time in running them through the fight.
At the end of the day, it's an MMO. It's not meant to be cleared as quickly as your common run of the mill single player story game. If you want your story mode without the challenge, youtube still remains. If you don't find the challenge of the fight any fun, why do it to begin with? That's an honest question. If the only part you are after is the cutscenes and story line, no doubt someone has made it all available somewhere and you won't even need to purchase the game. Although in saying that, there is more to the game then the battle contant. Such as crafting, mini games, RPing, whatever you may enjoy.