One thing I noticed with the Beta of Siri AI: She* is not as polite as she used to be. Responses are somewhat more articulate and elaborate, but for example, with regular Siri, after I requested a timer be started, I would say "Thanks" and she would reply "You're welcome," "No worries," "Sure thing," or something like that. With new Siri, all I get back from a "thank you" is crickets. Rude, I tell you.
*I use an Australian female voice, hence "she".
(iPhone 16 Pro Max, iOS 27.2)