On iOS Apple switched it to being the default update quietly in a point release: https://arstechnica.com/apple/2017/01/ios-10-3-will-be-apples-first-update-to-c

On iOS Apple switched it to being the default update quietly in a point release: 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... It actually shows marked performance improvements, but that's because it focuses on performance on the type of storage an iPhone uses.