Well, let me give you some motivation. Nginx is an all around superior product to Apache.
In the context of AEM, it has particular advantages.
(Please correct me if I am wrong about any of this.)
The way Apache works is that when a thread handles a request, it blocks on submitting the request to publish. Not a big deal when load is low and publish responds quickly. However, when load gets high and publish responds slowly or not at all, these blocking threads keep Apache from responding at al.
Nginx uses a task queue that frees up threads rather than blocking waiting for a response.
All that being said, we also use Varnish, which is largely ignored as a solution to AEM performance issues. Along with a lot of other advantages, Varnish offers ESI, which is not available on Apache or CloudFront...
Seems like visiting modern day technologies might be helpful. I hope you can share a road map for how Adobe plans (if they do) to address these items.