I do not think motion sensors or footsteps have anything to do about players beaming you from across the map with an AR with holo sights from hard angles.
@UP_LordPlumber I've seen numerous instances that could only be written off as cheating. Wallhacking is probably the biggest, and the reason its obvious is because there are giveaways when you know you've been spotted by an ability or gadget. This in addition to certain recon gadgets not detecting you if you remain still. I've been in multiple situations where a player (frequently on the lower rank side of things) will instantly find you, multiple times in different places, playing as a character who does not possess the ability to locate you with proximity or scan, and who hasn't deployed a motion ball (as you can hear it). There are also people clearly using aimbots, because you will have players who are single digit rank blowing heads off left right and centre and topping multiple matches in succession with high KDR. Likewise, some players do not appear on the minimap when moving near a motion ball, or when firing an unsuppressed weapon.
