[Nevcairiel]

The entire point of the new map API is to remove behind the scenes "magic", it now does exactly what it says on the tin and what you ask it to do. No ambiguity, no magic, no hidden C state. If you don't pass a zone, then you don't know which zone it choose to represent the coordinates in - and without that information, you can't use them properly.

Passing a uiMapID to GetPlayerZonePosition is certainly useful, since maps are an overlay on top of the real world, there is never just one map that applies to you, at least there is like the world map, the continent map, the zone map, and if you're anywhere deeper there is even more on top of that.

If you're worried about the overhead of asking for the map everytime, you could just track zone changes and update it only then (although there is a bunch of events one needs to take care of) - but generally, don't worry about micro-optimizations like this.