But I don't think it's very controversial to argue that iOS is more secure than MacOS (to the point of inconvenience), and that this is a reason why integration

But I don't think it's very controversial to argue that iOS is more secure than MacOS (to the point of inconvenience), and that this is a reason why integration with the health data on the iPhone will pose a challenge. The iPhone is also much higher stakes than MacOS in terms of total number of users affected by any exploit.