I played XI too. In fact, I was leading an 8 man Salvage group quite successfully, often doing parallel runs that included boss kills while a smaller party would farm NMs on another area.
We never really asked people to read on strategies with the content, you know why? Because none of the content had 6 different phases where every single party member was required to understand what the hell was happening.
No matter what people may say with rose glasses, XI was not a hard game by any means. The difficulty of the game came mostly from the fact that wiping one single time meant game over until next week's entry, so the amount of tries you could do was severely limited.
How many times did my Dynamis LS wipe to Dynamis Lord before we took him down? I think it was four attempts.
How many times did my first learning party for Titan HM wipe before I could finish it down? Dozens, and that party never made it.
In XI you could enter all content without knowing a thing about it because the dynamics of the fights were much simpler than XIV. It's not that I think XIV is a complex game, it's that XI is and always was a simple game. As long as some key people knew their role, you could be carried through a fight (assuming you knew how to play your job, obviously).
Dynamis is possibly the best example of this. I can assure you almost everyone in any Dynamis LS had no idea what to pull or when to pull it. Many probably never even saw where the mobs spawned from, and had no clue where the time extensions were. It was not required. This information was only needed to be known by the leader, the puller, the sac puller and someone that knew the best order to kill mobs. For the rest, all they needed to know was "Sleepga, make an assist macro, stun avatars if they wake up".
Before you think I'm hating on XI, I'm not. I played that thing for 7 years and quit right before Abyssea came out.