There's a lot of weirdness when you use a "pod" (which is literally a personal data silo).
If the instances are just a proxy to access data from pod-type storage, it gets weird when you have 20 people from other instances participating in a thread.
If a silo moves all the relational data breaks and the instances meta-data becomes inaccurate (which post is a reply to what post).
This is a really hard problem and would likely require a rewrite to do effectively