The longer I use Lemmy the more I run into posting on places where my posts will never reach anyone apart from my own instance. And then there’s a growing amount of communities which display normally for me but if I actually open them it shows they were deleted. We desperately need a way to make them send information to all instances which used their information to remove it as it got deleted. Or a signal from an instance to other instances and their communities essentially asking them if they’re still federated/existing. Of course not frequent, that’d waste resources. But happening enough not to make people lose time screaming into the abyss. Not to mention the utter waste of server space keeping content which cannot be used… :(
I think most of these things that people (users) want will come from app developers figuring out solutions. A list of each servers fed status and settings to block posts from de federated instances based on your current login, or some kind of multiple account situation where when your current login is de federated on an instance you are viewing it sends the comment on another account that is still federated with the instance you are commenting on.
The app doesn’t necessarily need to use any specific instance at any given time and could very possibly just pull all of Lemmy at once, check what’s ‘hot’ and tell the user if they don’t have any accounts with access to that instances federation when trying to comment.