All these statements refer to outside of abyssea, inside abyssea the rules are drastically different. In abyssea its mainly all about maximizing damage and having enough healing.
Not to call u dumb or say your topic is mute, but there are no miss-conceived notions on why certain jobs are better tanks than others. There are factual things that back this up. Nin is best on low defense and mainly non magic based mobs just cause of the FACTS that nin isnt the greatest damage dealer so when a mob has lower defense we can increase our damage output and still have other tools for keeping hate. NIN sucks with most magic based mobs cause they just eat our shadows to fast and we have no survivability at that point.
PLD is best for super hard hitting mobs and magic based mobs because they dont have to worry about shadows to mitigate damage and cause of all the -PDT and -MDT gear they have at their disposal.
If you don't know how to tank or the fundamentals of tanking by now, us talking about it is not going to help you.Personally I'd like to see some more talk about taking in general and less about why people think certain jobs are better than others for whatever miss-conceived reason.