Those were very high bloom in the first picture.There is nothing spectacular in those screenshots to justify those high requirements.I feel that Oblivion had better graphics than that.
Do you know what kind of problems the average user has with raiding in WoW and lag? Now take the graphics you have in FF14 and throw them at raids and what not (FF14 has raids and stuff right?) and you're probably going to need a decent setup to play the game lag free. Full settings and stuff, I'm SURE you can play the game with low settings with a much worse computer then recommended.
I'm totally just going off assumption that there is either raids and/or big pvp battles were you are going to have a lot going on the screen at a time.
I know I saw a post from someone on here a while ago that played the beta I think (I could be mistaken), and he was struggling with a pretty decent setup.
EDIT - For those who care I really recommend waiting till we get benchmarks and people who have tested the game at its worse before we judge what may and may not run the game to its fullest.