It seems like you don’t understand what AO is and what it is used for. Lumen is what I call a “general purpose solution”. It can resolve the lighting in general, but when it comes to some nuanced cases, high frequency or small details - Lumen sucks. It sucks so hard that Epic Games had to bake AO to textures to make their Matrix city look good. You can download the sample city pack and see it for yourself.
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