iJust thought about something.... Yoshi-P said there will be PVP for sure right? But just no open world PVP. (Taking this from one of his posts in the forums)

I mean even if we fight in arenas and instanced environments or in some PVP areas. We still fighting and killing each other right? Then balancing it is still needed to make sure that no one class raises above everything else.....

So now that we know that PVP will be there for sure.... and a PVP on/off flag preventing people from being killed when they don't want to. We also know that PVP balancing cannot be avoided since SE said there will be PVP. What exactly is stopping open world PVP?(keep in mind the arguments i gave above as in the flag)