You’re looking at it through the eyes of a competent user. It’s obvious to us. It’s not trivial to the general population. Just ask most iOS users what the difference is between green/blue bubbles - they have no idea other than “one sucks and means they use Android”
I used it as well on my Android, and the UI made it pretty clear when you were sending ‘unencrypted’ texts to someone.
You’re looking at it through the eyes of a competent user. It’s obvious to us. It’s not trivial to the general population. Just ask most iOS users what the difference is between green/blue bubbles - they have no idea other than “one sucks and means they use Android”