1. Encryption is obfuscation, not privacy. Private in data terminology means inaccessible; out of reach; not public.
2. Your encrypted content can be decrypted by ANY nsec leak which is party to the conversion. So it's not even in your hands. How many forms are your chat buddies pasting their nsec into?
3. The only encrypted part is the message content. Even with perfect security for all involved, anyone can see who you're messaging, how often, when - all the metadata is public af.
I hope it doesn't get any eyeballs before being corrected. "Nostr aims to decentralize public communications." Fixed. This was a false claim and I bet the OG devs like #[5] would agree.