I know you've probably gotten this feedback a lot, but this whole crusade of yours of trying to reduce decentralization on Lemmy is really counterproductive. If Lemmy users wanted centralization they wouldn't be on a decentralized protocol.

It's not a competition, it's about keeping an activity level in one place. It's indeed easier to stay subscribed to several communities, but once you start posting you always double guess which one you should post to ( https://lawsofux.com/choice-overload/ ).

This sounds like you're in favor of keeping everything in a single community i.e. consolidation despite claiming to be against it.

I agree

Allowing posts to be created for communities on shut down instances is something that should be solved with a technical solution.

Discovery of communities is a much bigger issue than which community someone happens to land on to look for activity. Once people get a sub list going they don't have easy ways to know new communities are being created. Even if they browse All they might be sorting for popularity. If they use Local they never see stuff from other instances. If they look at an instance they won't see content from defederated instances. They also won't see the external content that nobody from that instance has subbed to.

Having more than one community with the same name and topic is something that could be addressed by encouraging people to find similar communities. The easiest would be an indicator that other federated communities with the same name exist that they could review and maybe click the join button. The end result would be more people finding out about similar communities across instances and far less need for crossposting to get more eyeballs.

As a side note, large instances are preferred by users who mostly view because the more people means more federation since communities on other instances only show if someone subs. That means the big instances are the ones that will grow because they already show most of the content by default.