The point of the thread was to ask about the current status of Redis Unix Socket. Not to debate if LXC or docker is better suited for Discourse. I only mentioned why I was not using Docker because you seemed like you might be curious about it. For the average person docker will win every time, because its simple. That is also the reason that for the longest time so many applications used mysql instead of postgresql. But I absolutely love postgresql.
Until I run into some kind of devastating problems I will definitely be sticking with LXC, it just performs great! Also I couldn’t agree more that if you think you might need external support that you should probably stick with whatever the recommended defaults are. I myself have 20 different services all in their own LXC containers, running in a single Proxmox node, and they are all running great, and that is just a single Node in a Proxmox Cluster. Automated backups, Monitoring, Migration between Nodes in the cluster, these are all great things 
Did I mention that my install went smoothly? So far I love Discourse, other than having to use localhost for redis instead of unix socket I had zero issues, will try and remember to post back in a few months to let you know if that is still the case 