APFS is generally not appropriate for HDDs, so yeah, I expect they'll keep supporting HFS+ for as long as they keep supporting non-flash storage. In any case,

APFS is generally not appropriate for HDDs, so yeah, I expect they'll keep supporting HFS+ for as long as they keep supporting non-flash storage. In any case, if the situation changes, I expect there'll be enough lead time for me to adjust my strategy -- the failure scenario is completely different than rotting physical media.