I wish Signal stopped using it. I know you can set a Signal PIN but a lot of the non-techy friends I speak to on Signal probably wouldn’t think to, or look through the settings (not that you need to be “techy” to set it, but you know the kind of learned helplessness most people have about tech). At least a prompt for all users to set an account PIN so their account can’t just be stolen by anyone with their SIM card.