I updated my iPhone 15 and 2018 mini just fine. Favourite features so far:

-Coloured dots in the calendar!

-RCS stopping that annoying “<person> liked <entire message you just sent>” text message

-iPhone mirroring on my Mac is pretty neat

Always wait until your iOS device asks you to update, don’t force it on day one because of problems such as this.

Owch…

And like with Microsoft products, ALWAYS wait untill at least the .1 release.