It seems to me that fret size has more of an issue than radius.... perhaps 70% fret size, 30% radius.
In regards to bending it does. A smaller radius is going to fret out (buzz) during bends more quickly than a larger radius, given the same string height.Unless the nut and/or the bridge is cut to a different curve than the fretboard, the radius has no impact on how low you can get the action.
Oh they are indeed marvelous.I've noticed the most difference in fret material. Stainless steel frets are very easy to bend on. I don't think I have any fretboards with a radius below 10", so that's never been an issue.