WM bonus has no effect on opponent quality in WM versus on a Legion PvP realm, that I can detect. My experience of combat with WM world questers and Legion PvP realm world questers is the same, except for numbers. They are equally variable skilled. The BfA zones are just more active than Legion PvP realm zones, and we have other WM features like bounty to mix things up. PvEers don’t do any harm in WM, their numbers are naturally limited by PvP activity. What matters more is achieving roughly equal numbers of player type per faction.
Ganking is what it is, always been there. The community seems okay with it.
Edit: the sharding, phasing, classes and community survey is showing interesting results. These surveys are still in progress, but seems like dissatisfaction with the impact of sharding and phasing is more important to the community than bonus system or ethics. We’ll see what end results are when max 100 responses is reached tho.