[karurosu]

This seems like goal post moving. The question was if the migration was complicated, the answer is yes. Whether or not APFS is revolutionary or the best option is not the discussion. The core fact is that Apple needed to move away from HFS+ and they decided to move to their own FS, which brought in a bunch of changes that are standard in other OSs.

And they did it in a smooth and fairly uneventful way, so that's remarkable.