I didn't agree with their decision at all at the time, but now that I realize they made it a little while after it gained widespread adoption and people stopped using it because "Signal isn't actually secure!" ... seems like people were expecting a secure messenger to be, well, secure. So they would chat about anything and everything thinking "I am using a secure messenger, these messages can't be read..." and tech ignorance is a dangerous thing if you're trying to be secure. I would've preferred a colored window and un-closable message for SMS chats, but oh well. I like that they've introduced usernames so you don't have to give out your real number.