And that doesn't get clarified by UI that distinguishes between encrypted messages and SMS, because Telegram doesn't have such a thing to distinguish between.

And that doesn't get clarified by UI that distinguishes between encrypted messages and SMS, because Telegram doesn't have such a thing to distinguish between. My point is that all of this is orthogonal to whether Signal can successfully make UI show users when they are sending encrypted messages vs unencrypted SMS. Most of the confusion you are citing is about whether an app does encryption or not, and that is a totally distinct problem domain.