Well of course that's the most important one, which goes even without saying, I was just working with (my real life) scenario when you are able to convince someone and then they have to deal with inferior service.

There were 2 things I liked about Signal, shared photos had much higher resolution than compress Whatsapp mess and I didn't need extra app for SMS, I couldn't really care less about privacy, since it's no more private than half of the other messengers.