@MostHost_LA, no. Just… no. 
You’re thinking of the freedom you have in UE and applying it unilaterally. I am telling you right now, that isn’t always the case - and the more specialised the software, the less likely these sorts of things are to be freely changeable.
Using the Revit example, you do not just get to rotate the axis. If you need to move true north, technically you rotate the entire bloody world (I am not kidding here 
) to suit Revit’s axis. You don’t move Revit’s axis to suit the world - Y is always North; X is always West.
Programs like that are used for fairly complex solar analysis studies and the like. So I understand why their devs don’t let end users mess with its internal coordinate system. So that, and the fact you can export from Revit to Unreal renders the question reasonable. Just because the answer is “it’s redundant/irrelevant/immaterial” doesn’t make the question so…