Mac going 100% to APFS

My understanding is the next release of Mac OS, 10.15 I think, will drop support for HFS+. For fun I converted a Drobo to APFS and it seems to have worked. However, I am told it really doesn’t. What is the correct answer?

Note, there are things Drobo can do that are not officially supported but work. Might this be one of them?

One of the things that has worked for over seven years that I found out later Drobo says you should never do is I used Disk Utility to partition my Drobo. By the time I found this out it was too late to consider going back. It is these partitions, rather than the Drobo itself, that I am trying to convert to APFS. That may make a difference.