Siri does a few things reliably for me: playing music, making phone calls, smart home commands, activating shortcuts, setting timers and alarms. Google Assistant is better at fielding basic questions. Alexa skills like 'place a Pizza Hut order' are cool in theory, Grubhub integration has a lot of potential as a concept. And ChatGPT is head and shoulders above in language comprehension, response, knowledge reproduction, and reasoning.
If you could get all of that into one digital assistant you'd be at the head of the pack.
In the meantime, the best way for Apple to "catch up" would be emotion recognition AI. Have Siri detect and track how you're feeling from voice samples, notice patterns, and respond with automations or suggestions. 'You sound stressed, would you like to take three minutes to meditate', 'I'm glad you're in a good mood, it's 11 a.m., I recommend channeling that energy into work before lunch.' "Focus mode" on steroids. All optional, obviously. Schedule "check-ins", or just ask "Siri, how do I sound?"
The capacity exists, it hasn't been implemented anywhere. Apple has the reputation for privacy and they're easing people into tracking data with Apple Health. It's also a narrow, modular feature..