Why is FFXIV considered to be so hard/hardcore?

[Edli]

You people keep talking about these MMos of the past and how they were several times more difficult. I played a lot of them and I don't see it. I remember on WoW I would park my healer on some corner and play whack a mole on healbot. The difficulty was in how fast I could click on names. Or with a DPS, stay in the feet of some gigantic boss and furiously mash buttons for leet dps.

I have never experienced a fight like titan ex before and how everyone in the party must move around a lot to avoid one shots. The main reason why I find FFXIV fights difficult is how much movement heavy the fights are, something I rarely experienced on past MMOs.