Not sure you understand the argument. If you allow people the ability to access iMessage however they want, how do you prevent iMessage spam? You may not care about this, but a lot of people do.
How does connecting to a smartwatch enable spam? None of the comments here explain in detail how that would happen. The messages still get sent through an iPhone and through Apple servers. It's not like Apple is giving up any control over those.
It isn't easy to do with just AppleScript on a Mac. I run a sports team and I wanted to send out a message to people for special situations. Some of the challenges are that you cannot script sending a new message if there isn't already a thread -and- it seems like you must use the same contact info (email or phone number). There isn't much feedback when it goes wrong. Some of these do make sense for preventing spam. I suspect I could have used the accessibility APIs to drive the UI. I eventually gave up.
