Its not absurd at all. I think the best explanation of why we don't/won't have it has something to do with Larian feeling it doesn't suit multiplayer.
It can't be an issue with the engine as it seamlessly copes with the transition of Auntie Ethel's home from pastoral meadow to evil swamp. It even gets darker and the weather changes from sunny to overcast.
In the end they're just simply refusing to do it. we are all left to just guess at the reason.
