@steve35FU7 never...
they, I mean Autodesk they do not understand it, Fusion is type of mouse clicking software, they love Mouse. They probably have never worked with 8 or 12 layers PCBs, thus they have no idea what are you talking about.
I asked about this like year ago, there was only some response that it is problematic, because of Eagle roots...blabla etc .Thus it is not for professional use. They like people with top and bottom and thats all that is their target market. They think why do you need switch effectively between the layers if you could have just two top and bottom?!.
50 years ago IBM boss said that there is a place for maximum 5 computers on the world and no more, and autodesk is saying it is enough to have 2 layers not more.
You actually should be happy that is is not crashing 10 times daily.