It defaults to Apple Intelligence "on", which they had already declined in the last update. So, turned it off in settings. Then discovered they had to turn it off in each app that uses it individually.
That is not good, Apple. Terrible UX.
All the other changes were just as big of a hit. Mail went wonky (the Categories view is not great). The iMessage apps list is now gigantic and many of them you can't turn off, only reorder.
Honestly, this Wall Street-influenced AI goldrush is getting out of hand. Apple used to be better than this. The last updates to iOS did not make the devices better, just different. I'm staying on iOS 17 as long as I can, my feeble iPhone 14 won't do Apple Intelligence anyway, but I also don't want 18 and its changes.
Honestly, I'm about ready to just move to a flip phone. The only feature I really need is a WiFi hotspot.