Earlier quoted context omitted.
Sounds like Siri - unable to control much of anything on the iPhone outside of reading/sending text messages and setting alarms.
And that’s ok. Those are core features of the phone that absolutely must work reliably and consistently. Far better to do a few important things really well than a hundred things execrably.
It would be nice if it could control 3rd party apps too, like GMail, but being able to control the stuff that Apple themselves have built doesn't seem a lot to ask.