Plus, it's just a terrible UX for a SMS client. I really wanted to like it, but it's just too obnoxious to use. I've certainly not recommended it, I've had better luck switching relatives to Linux mint (seriously, I am not exaggerating). Creating a group MMS is annoying, and there's a nag screen if you try to call someone from a message within the app. I understand that most of these problems are due to the secure nature of the app, but trying to use it as your full-time SMS client is just too much of a pain. I'll likely still keep it installed, as the 1 thing it does do is make it really easy to transfer files/send messages between devices (send messages to yourself, then download them using the client's for other OS's).
Personally, I don't feel the UX is "terrible", I can use it to do most of the things that I could do in WhatsApp. My friends and I also tested out the video call feature and found the quality to be the same, if not better.
That has never happened to me.
And after it started insisting on creating a PIN each time I start Signal, I finally deleted it from my phone.
You can forget about security if you can't get a seamless user experience.