It's unlikely they will allow Siri to perform actions which involve potential loss of data for obvious reasons...
If what you are saying is Apple's true motivation behind Siri's current very poor performance on desktop Macs -- personally, I am not convinced that this is their motivation -- then this is just more evidence of how much Apple has been dumbing down things for quite some time now, and acting as if we are all idiots.
There are a million and one ways for a user to lose data on their machine or device. Apple cannot baby us every step of the way, or protect us from all of them. We need to take responsibility for our actions on our machines, and think things out.
If Apple is concerned about data loss via commands given to Siri, then they can easily build in certain safeguards, just as they do with the rest of the OS; but in my view, they should not take away such basic choices from us, such as shutting down apps, emptying the trash, etc.
For example, in the Finder preferences, we have the option to be warned and questioned before the trash is emptied. In Siri's case, instead of just saying that "she" can't empty the trash, she could say "Such and such is in the trash. Are you sure you want to empty it?"
I am sure that it would be very easy for Apple's coding geniuses to implement such safeguards, instead of taking these options from us, and making the decisions for us, as if we are little children.
You may not agree, but that is my take on it.
