Agreed. For iOS, the rollout was so smooth that most people weren't even aware it was taking place, with the only observable effect being that the iOS upgrade took a bit longer than usual. For the macOS rollout, there were more hiccups, but still, extremely smooth. In fact, I just had to launch Disk Utility to double-check that this computer was in fact migrated to APFS because I couldn't recall actually seeing anything specific about it (as this computer has a fusion drive, as well as a Bootcamp partition).