Ever heard of the expression "Rome wasn't built in a day"? Same thing applies to games. You don't toss out "complex" systems at release without the battle system going through the ropes. Just look at all the problems Warrior had at release.
Side-note though: I just have to lol at your jibes at FFXIV being simple (in some aspects it is, others it's more complex) and unchallenging, while FFXI was complex and challenging. People need to stop "glorifying" the challenge of FFXI when most of it came from players being at the mercy of rng. As for complexity, well, it is true that we gear swapped a lot. Can't really say that I miss those days though.