For me, the speed of find and grep is sufficiently never a concern, so I do not find these speedy alternatives sufficient to compensate for its non-universality. And when the speed of grep and find do become a concern, I would think the issues are somewhere else -- like have 10s thousands of jpg files scatter everywhere that you need to find in the first place. When issues are somewhere else, replacing it with better tool only hides and makes the problem worse.