Yes, some people question the ridges / grips on a fixed (non-rotating) bezel, but to my eye, it's all about style. People never (or very rarely) use the Tachymeter bezel at all, so it is also more of a decoration. My best guess -- this is the style bezel for the current Formula 1 chronographs, so they left it alone for the Fragment version. Also, I wonder whether making it rotate would have made the case thicker. This case is 44 mm across the dial, but a nice 14.4 on the thickness . . . and I'm all for keeping this kind of case thin.