Have a look at the ars review which may answer your question: https://arstechnica.com/gadgets/2017/09/macos-10-13-high-sierra-the-ars-technica-review/6/#h1 My takeaway from it was, don't partition an apfs drive, create volumes instead. Volumes share space, partitioning does not. Now, if you wanted a single drive to have a macOS partition and a windows or linux partition, that would be possibly a reason to partition. I don't even know if that's supported though, if windows or linux could run on an apfs formatted drive. I don't understand if an apfs container === partition. apfs containers contain volumes. Maybe a partition (you would typically have a single partition on an apfs disk, ignoring hidden partitions like efi) could have >1 container? And each container >= 1 volume?