Pre BFA, multiboxing was a hobby that didn’t give you a significant advantage.
Post personal loot, post multi pick resource nodes, it’s functionally no different than if Blizzard was selling a “premium subscription” that cost more, but gave you a loot modifier.
If they removed the economic incentive to multibox, I’d immediately stop caring. But they are objectively destroying the in-game economy by driving material prices below raw gold GpH levels for non multibox players.
The above is why there are so many hate threads. Coincidentally it’s why you have the same people screeching at people for bringing attention to it. They don’t want to lose their unfair advantage.