I believe the answer is that MSFS (like all default MS sims before) rely on the pilot flying the correct published approach. ATC was not designed to give you obstacle or terrain clearance, and neither unfortunately was this.
In order to make this feature realistic, just a general 2000 ft or so, probably won’t do.
How would you descend to an airport in mountainous terrain?
This ATC should issue instructions in conjunction with published procedures.
I am hoping some changes like this come with the ATC upgrade that has been talked about.