If the descentralization of social networks continue, we will have to prepare for the eventual rise of the instances wars, where people will start to fight about which instance is better and which one is weird to be in and so on, but that’s for the future of us all.
Would an app that pulls directly from each server (anonymously) or an app that pulls from dedicated servers (while logged in/subbed) be better? The first is more efficient but the instance owners likely won’t be [financially] supported, while the latter requires duplication and is prone to defederation issues. In the end I suspect overcoming defederation will be a significant design goal of third party apps.