The threat model for prevention of censoring Signal was originally developed around China, Best Korea, etc.
The original reasoning why WhatsApp used the same crypto/messaging format as Signal was in large part (aside from it being Good Crypto) to make it harder to selectively block TextSecure/Signal based on message content.
So the threat model is now changing (if you're trying to avoid censorship by the US govt etc) and that's going to be interesting to watch unfold. Matrix is much less susceptible to this being an existential threat, of course.
The original reasoning why WhatsApp used the same crypto/messaging format as Signal was in large part (aside from it being Good Crypto) to make it harder to selectively block TextSecure/Signal based on message content.
So the threat model is now changing (if you're trying to avoid censorship by the US govt etc) and that's going to be interesting to watch unfold. Matrix is much less susceptible to this being an existential threat, of course.