I hate to say it but this is becoming more and more common in the last few years.
Apple announce all their tentpole features for the next iteration of the OS in June - it goes into a 3 month beta/public beta programme for general release in September....
..... but more and more features are just not present in the first release - or the second.....
And in some cases we don't get features until .3 or .4 which come in March or April the following year just 2 months before the NEXT version is announced.
There is a fair bit of frustration this year that Apple Intelligence isn't ready when the new iPhones are delivered - and indeed won't be in its entirety until well into 2025. Personally it stopped me upgrading the phone this time because what's the point when, by the time the features I was promised are released, the phone will be 7-8 months old already.
Surely it would be better for Apple to not announce features that WONT be ready for the .0 release in September or .1 at the latest.