I'm desperate for a personal AI assistant, but do I really want to become the kind of person who can't function without the friendly robot voice in my phone?

At its annual developers' conference, Apple put the spotlight on new AI features, while highlighting security and child safety — and critiquing the company's AI competitors.

Siri debuted in 2011 and is accessible through the bulk of Apple's installed base of 2.5 billion devices, but hundreds of millions of consumers have been chatting with apps from…