A use case that you might actually relate to is another thread in the forum that I currently cannot find any more. There, someone asked how to connect two walls which have a different thickness and that are connected but NOT at the centre but on the outer edge of both walls meaning the wall looks like one wall from the outside but it looks different from the inside since the wall is less thick starting at a certain point.

The answer given in the forum was "this is not possible in Sweet Home 3D". Not a very helpful answer and the option I described a couple of times now would also easily fix this issue / use case.