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As far as I know, none of these things were ever a part of virtualbox-ose.
In addition, the target market for VirtualBox is server virtualization and Oracle does not have any interest in doing business with home users, but does benefit from having them be testers. It would not make much sense for Oracle to begin charging home users for closed source components that they currently give away for free, so as you said, I do not see what the problem here is.
Most typical home users would be Linux users wanting to host Windows inside a VM to run basic Windows apps without needing Wine or even for testing Linux distros
Some developers might want the full package for doing server testing/development at home
Bochs? Since Virtualbox release it has lost a great deal of attention, as VirtualBox is a fork of Bochs. I wonder if all the great things and improvement Virtualbox have received over Bochs have been merged back? It could be a great time to merge back if not. I'd also love to have the Virtualbox GUI with Bochs.
Virtualbox is a fork of Qemu (which I don't believe is related to bochs). Qemu gets boatloads of attention at least in part due to KVM.
Bochs is nice too especially for debugging, but Qemu can do most of that as well, plus user-mode emulation.