Eh, the reason it's implemented in PVP is because it's a one and done event, so gauging ones abilities is easier than say in coil or other events where a wipe can occur.

You would have to tell the game to "reset" the accumulated points each time a wipe occurs and to only count a win, but asking the devs to implement a system like that isn't as easy as the way it's implemented in pvp, because if with death in pvp there is no such thing as a "wipe" because the event is a straight run to completion, there is no "wipe" and start over concept to those content.