Threats of consequences without follow-through result in deafened ears the next time the threat is made. Failure to affirm expectations met leads to a "Doing Well Doesn't Matter" mindset.
Expectations mean little to nothing at all until they are coupled with accountability.
Accountability solidifies expectations when words don't. Accountability keeps the standard high because threats won't. Accountability adds value to a job well done.
Talk is cheap. Actions matter. Leaders of excellence set the same high expectations as everyone else, but the expectations that mean the most to them are the expectations they set on themselves to hold everyone accountable for meeting the goal.
Do your expectations matter to those you lead? The answer is not in their adherence. It's in your leadership skill of accountability and your support to guarantee that expectations are actually met by all.