AirRabbit:
As I said, let's agree to disagree pending the final report for Dillingham.
In all my years of flying I have never been issued an "at or above" clearance except for a climb or descent restriction.
I posted the SLC MVA chart to show how complex the FAA makes such charts in mountainous areas. If you have flown international you have seen Jepp's reproduction of MVA charts for countries that make them public. None are as nearly complex as that SLC MVA chart.