v.93, Big Bang Update Notes

Accuracy will not affect things all that much, no. But a 1 lvl difference wont make you miss like there was no tomorrow either, I'm sure.
But come on, just drop the old MS point of view, this is a new system, and really, there aint nothing odd with not hitting higher mobs at a 100% rate. Many games have adopted such a stance in the past.

And within a year most of those using that system actually had to revise it to allow at least players -5 the level of the monster to fight it before the accuracy reduction kicked in as players started complaining that it wasn't working right. If I remember correctly Final Fantasy 11, Ragnarok Online, and even Warcraft tried this... and it didn't last.