Apple products usually have a decent level of polish, I hope it’ll be done in a useful way.
I wouldn't even be surprised if they add it to the calculator app at first. Next version they'll keep the vaguely plausible integrations that people actually use. Which will be very few.
Some of this will be justified internally as experimentation and data collection. This used to be called taste.
In actuality it is because they don't want to be perceived by the markets as "falling behind". We gotta do something, this is a thing, and therefore.. arm flail
All the incentives at play point squarely at enshitification.
Working with OpenAI is interesting. That means they can cast their proposition off or replace it later. Even they know it's a massive risk.