Regardless, as I said, centered is not a 3.5E, it's an awkward DDOism. There is no reason what so ever that a monk should lose anything while fireing a bow in 3.5E, they just can't (obviously) flurry with it.
They lose nothing with a bow now.
All the things that required "Centered" are things that build upon and improve Flurry of Blows.