Ever since APFS came out, I have been checking with Alsoft to see about DW being compatible. It has been a few years now (at least 3, I think), and nothing has happened. You can read Alsoft's take here. My guess is that DW will never be upgraded.
Disk Warrior is based on a deep understanding of the intricacies of HFS+ which is conceptualized around rotating mechanical media and APFS is a conceptual
clean sheet of paper re-do for the file system for use on radically different media that renders much of what DW does unnecessary it not infeasible, so you may be right. At the same time Disk Utility has evolved to do a credible job of rebuilding directories and costs 100% less than DW and is the only tool I have actually
needed in years.
