I also was thinking about building something on Nostr. But it seems that there are some deeper architectural problems that are not easy to fix on the client level.

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Also I know personaly people who made a Nostr client, and it still doesn't work good enough unfortunately (several years in development). Of course, it's easy to say that everyone just have skill issues and MY solution will be better, but I'm afraid at the end we may just end up with multiple bad solutions...