Earlier quoted context omitted.
> I dont see any reason why an app approach cant support that. Matrix clients have e2ee encryption like Signal or WhatsApp. Every single one of my close contacts that I have on my server have ignored or misunderstood the instructions to download and store the recovery key when they first access the servers. I have customers on my support channel who keep trying different clients (Element, ElementX, Fractal) and every…
Sandboxing keys on the device is indeed removing one point of nostr, but to clarify on your point: The difference between Signal and Nostr is that in nostr there are hundreds of independent servers (relays) that your app broadcasts events to, whereas on Signal it's just one centralized server.
There is nothing special about independent relays. ActivityPub also have relays around. Store-and-forward is how IRC works.