Hello,
As you have prioritized PvE by removing 100% of defensive means from grind spots, the game has become a breeding ground for griefing. Given that classes are not balanced and even with a 30 GS advantage against a PvE meta class like the Scholar, we cannot grind.
I suggest you follow through with your reasoning and make the game 100% instanced, so we could grind wherever we want without being subjected to griefing. Alternatively, reintroducing guild wars could be a solution. Those who bother us at grind spots and complain will not have to go to the marnie.