I thought it was underwhelming. The fact that integration with ChatGPT is not seamless pours cold water over it. Siri will seek your permission each time before passing the question to ChatGPT. I can avoid that step by using ChatGPT directly.
Personally I feel less and less comfortable giving OpenAI access to my private data tho, so I’m really happy there’s a divide. As you said, if you really just need ChatGPT for something you can open that app. But I’m happy the default isn’t to send all Apple users requests to OpenAI all the time.
I think this is good. For folks like you, that will always be an option. For people that have yet to touch ChatGPT and "still don't know how to access AI" (I've heard this sentiment from many people that couldn't care less about it all) it's a perfect balance. Siri will operate as you expect, until one day it prompts you to pass your question over to ChatGPT. You can opt out or give it a try.
I do agree that the extra tap is a bummer for anyone that wanted ChatGPT baked into the OS, even easier to access than it is in the ChatGPT app.
On the opposite side, it not being seamless is entirely why I would actually trust using the new Siri with any sensitive data.
I am not entirely sure I will ever actually allow it to connect to ChatGPT for privacy reasons, but having the option when it can't be handled another way is nice.
I imagine this is more a stopgap until more and more of this can happen locally anyways. Especially since it sounds like Siri determins when it should reach out.