Just play the game, experience comes with time, practice makes the Master, but there is no point in complaining about mechanics jsut because you die a few times, take your time and learn them.
The difficulty of FF14 is low because it's combat painfully slow, i have played it for a little bit, up to lvl 70 or so but my subscription ran out before i got into endgame, maybe it gets more challenging later?
Final fantasy is a huge Franchise to begin with, thats also why it has a lot of players, it borrows from all over the Final fantasy and Square Enix universe, for example Nier Automata has an own story line and raid there.
FF14 also has difficult bosses i had to learn the mechanics, we wiped a few times in those 1 boss raids before everyone understood what to do and then we beat it.