Now when You say "Better than Signal"... Infrastructure and centralization aside, are You saying this is actually more secure than Signal? I mean Signal the mobile app, not the desktop version.
Discussion
in theory yes if it's sent to only inbox relays you control, but not sure how common that will be. in practice probably not.
We have to make it common. Otherwise there is no point in Nostr.
I don’t see how you can make this common. People will centralize around large inbox relays. This always happens.
Unless the inbox relay is the phone/desktop node itself over tor or something, and clients opportunistically keep retrying the send, but that would be unreliable.
Make deploying a DM inbox server as easy as creating a new spreadsheet on Google.
I completely agree with your point of view, but popularizing it among ordinary people who are not professionals requires simple and easy-to-understand language.