I worked with Cisco ACI and NSX. One thing i love about ACI is, you can overview a "large picture" of your topology at their APIC. That consist EPG, contract, L3 Out, ETC in single picture.
So, why NSX does not have that a feature that can generate topology? its like diagram view at vsphere client, where i can see my host map to any datastore, and VM, thing like that.