[arthurfm]

The only bad thing about Apple supporting APFS on Fusion Drives is that it gives them an incentive to continue selling future iMacs and Mac minis with Fusion Drives.

Having had to replace failed HDDs in Fusion Drive iMacs at work, it's certainly no fun. For all new Mac purchases I ensure they are SSD only now.

[mrpippy]

On that note, I am surprised that they added Fusion-awareness to APFS, rather than just putting APFS on top of CoreStorage.

It certainly is better to have the filesystem aware of the Fusion situation, but...measurably, significantly better? Would the experience have been significantly worse without it? 10.13 betas allowed APFS use on Fusion drives, presumably without any Fusion-awareness in the FS.

I'm surprised, but happy to see they did it.