Sorry for multipost, but this is a separate bug/oversight from previous post:
Not even sure if it is an oversight, but i think it might be.
The "Colliding Worlds" runeword was introduced sometime after the bow druid rework and before 2.0. It features the "Pathfinder" passive skill. Prior to 2.0, Pathfinder provided 100% of fire pierce as cold and lightning pierce. This functionality has been moved to another passive in 2.0 and I think that it was not intended to also remove this functionality from this runeword, since the runeword does not provide anything else of much value (very little flat phys. dmg, no flat ele dmg, no procs and only a little ied%/ds from post 2.0-pathfinder) compared to the other bow rws, SUs or even the rare-item affix pool
If this was unintentional, I would like to see this functionality back by also/instead giving +1 to Tracking (the new passive holding the pierce-transfer funtionality)
edit: my bad, the ewd is actually okay. The other stats aren't great tho