For example some time ago when Signal was still called TextSecure, we converted all our group chats for a friend group of technically minded people to TextSecure. We all agreed that encryption is important and worth some minor discomforts. We switched back to Facebook (which we all dislike) within a month because TextSecure didn't have consistent message ordering in group chats, making some conversations impossible to understand for those unfortunate enough to receive messages in a bad order.
So while I'm able to get people to try it out or use it for "sensitive" stuff, these issues really hurt usage and I'll just end up reverting to SMS once a day at least.
Edit: I don't want to sound to be complaining too much. I love Signal and try to convert people. Just hard when basics mess up. And it's also frustrating because on the surface some of this stuff doesn't make sense.
Would make those that insist on ZRTP in my life a lot more convenient to have extended convos with.
My messages go into the ether without any indication that they are not being received.