The interface on iPhone still can be improved - latest ones have dedicated action buttons and camera buttons. Once you can plug it to better assistant and do it without phone unlocking then it becomes more seamless.

Make the same with apple watch to make hand gesture covering your ear like listening to something and then you don't even have to pickup phone from the pocket.

I think there is a lot of way how iphone, apple watch, airpods (case as pendant) could deliver the best UX but it doesn't matter as long as siri sux.