Breaking the Mirror – A Look at Apple's New iPhone Remote Control Feature [video]
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2. setup shortcuts with a timer to access mic when disconnected from a Mac.
3. add BT/Wifi devices when connected to Mac (aka persistence by author).
4. stolen device protection bypass given you have Mac signed in with same Apple ID.
This is probably much more complex and time consuming than what was done here but it also brings a whole new level to the tracking on iphone.
I could very well see the NSO Group and other pegasus spyware maker abuse it to access iphone, maybe more in situation where you get close to the victim like border checks, police patrols and so on.