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If you're on iOS 10.3, you've already been upgraded from HFS+ to APFS. I believe this was done for all iOS users without much notice. https://arstechnica.com/a

If you're on iOS 10.3, you've already been upgraded from HFS+ to APFS. I believe this was done for all iOS users without much notice. https://arstechnica.com/apple/2017/01/ios-10-3-will-be-apples-first-update-to-convert-storage-to-apfs/ https://arstechnica.com/apple/2017/01/ios-10-3-will-be-apple... So to answer your question, maybe not so beastly.

pvg 9y ago
This is about the macOS update. High Sierra is the first macOS release with APFS as default
- deedubaya 9y ago
  Yes, I was just showing as an example of how seamlessly they were able to upgrade iOS devices to APFS.
  - pvg 9y ago
    It's a far more constrained (and typically, more frequently backed up) environment. I don't think it really answers the question of 'how is it going to work out on macOS'.
    - masklinn 9y ago
      Of course not, but it shows that transparent in-place update should be possible.