Hmm, I have never heard anyone mention "knowing its... unencrypted" I doubt most iOS users would care about that, realistically. Note that the experience is bad in both directions (at least for me in Signal on Android I get to endure a lot of 'so and so loved whole-text-of-previous-message' instead of just a heart emoji - I see that GOOG has improved things Messages recently to parse those, at least)