People want a chat app. If your secure chat app sucks as a chat app, it doesn’t matter how secure it is. It failed the primary use case it was meant to be developed for.

But keep in mind, Signal’s nature is no excuse to have shitty app implementations. In particular to have desktop apps as second-class citizens (and tablets as exterminated not-citizens). You can be a secure chat app. Signal got the secure part done, they’re just struggling with the chat app part.