What is GGG's official stance on multi-clienting/dual boxing?

Honestly I think that you will waste your time attempting something like this. Firstly it will be difficult to level up characters that wont die in the map, this will take you time where you could have spent levelling a singular character more efficiently. Secondly, if one of your characters dies even more of your time will be wasted because you will have to re-level them up again.

The current exp formulas & loot mechanics are designed to make this type of behaviour more difficult, and im sure there will be even more hurdles in the future that will slow you down. Given all this, I think you will actually end up losing out more than you gain from the significant time investment this will take from you. (This used to not be true, but now that the party mechanics were tweaked you cant really do this in a very time effective way)

Im not saying doing what you suggest is impossible, I think you can do it, and probably gain short-bursts of slightly better loot.
But I think you will ultimately be slower than other people in both levelling and obtaining loot in the short, medium & (If your other characters dont die ever this might not be true for the long term, but I think you will be behind for a minimum of 3 months regardless) long term.

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Planetsurvival wrote:

Botting means to eliminate human-game interaction entirely.

No it doesn't, which renders the rest of your post meaningless.

Still, it's quite obvious from the description of your plan that you have yet to actually play through the entire thing and get to end game maps. It simply won't work.

There are a few weak spots in this game that a bot could exploit, but I think GGG are probably aware of them, and the tools and method you're describing simply won't get the job done.