Procedural building generation with blueprints and Nanite

What are the implications of Nanite for procedural generation with blueprints? If we look at environmental design and especially buildings, why would you use for example Houdini to generate large chunks of buildings procedurally, while you can now just use Nanite and Blueprints?

Let’s take a wall for example. We can just use 5 different decimated Zbrush models of bricks and build a wall with blueprints. This would be highly efficient as they are just instances. Maybe the masonry would be problematic? But If you include that with a few bricks model it could work.

Does anyone have an idea of what is now possible with Nanite in regards to procedural generation which was not before?