That can get clunky though. If I make a post, I want to see all comments on the post. I don't want to have to hunt down all copies of the post and read the comments on each copy.
You're talking about a fundamentally different user experience. Not just a change in underlying architecture.
Though there are ways to be more decentralized without manually replicating data. Like Nostr.
Mint broke for you? That's the first I've heard of it.
Also if you have a habit of shutting down the PC during updates, check out atomic/immutable distros. They are almost impossible to break. You can pull the power during an update and it'll be fine.