wonderoflthe main way i think that info MIGHT be useful is if ur trying to ctap rockets that are being shot at you, problem is if ur good enough to do that u probably dont need that info to begin with lol.
Well hey some people simply have bad senses of time and position (usually people with ADHD), so it may be helpful for those people. Also our approximations of in game speed aren't always accurate.
Likewise it might be useful for some people (maybe me) to display health in their crosshair, since they can't easily peek at their health or count their health mentally without losing focus on fights.
(At this point though I think I just want excuses to use proxies 24/7. lol)