May 01, 2018 - 09:41 PM
I am not aware of any recent changes to this, but stand to be corrected
May 02, 2018 - 03:36 AM
I have experience issues around new feature such as HeapCompression which requires ACO, so in that case you cannot really avoid it and need to document the patch that launched it.
Lastly, there are things such as "SecureFiles (users)" features which in previous versions (11g) needed ASO but in 12c does not; unless the deduplication or optimization.