Signal removed SMS integration, making adoption less likely.
When I could install Signal on my parents phones, and they could SMS and Signal message in the same app, it was great. Especially since any contacts that happened to have Signal, it just worked. My parents didn’t have to do anything.
After Signal removed SMS, my parents just open up Google Messages and message everyone from there. They don’t want to juggle two apps. They also don’t really understand it. They just go back to the “main menu”, select their friends name, and type. Signal shot themselves in the foot.