For normal end user average usage signal is the best option available, specially for family since they may already be used to the flow and UX of it. Simple and straight forward. All the "bad" things you read are about nerds being annoying and not liking a very particular specific thing and thinking that specific thing should be the only focus.
So just make people use signal. It's the best and simplest way with the most common features for individuals and small groups. A simple download, in a common known place on a store without confusing people with differences between a protocol and a client and with and onboarding experience most are already familiar and ok using.
Even so you still need to make sure that the app does not have battery optimizations turned on, but that applies to all apps used for communication that are not blessed in specific phones (like facebook and whatsapp already having that setting by default because vendors make it so).
Hitler also didn't happen overnight. We all look back in history and many ask "how could they not know what was happening" and "how could they not stop him". It's all happening in real time, and nobody gives a shit as long as they are not the danger group being put in the gas chambers.
It will only stop when millions are death in a decade or more. If it ever stops. Hitler didn't have the strongest military in the world and nuclear weapons to use willy nilly.
For anyone who controls time travel this is the fastest algorithm ever. Probably gonna change everything when we are traveling through space and passing by some dark holes.
Imagine if a little bit of those so many millions that so many companies are willing to throw away to the shit ai bubble was actually directed to anything useful.
Yeah, people really have a big problem understanding "I'll buy the latest, since it's the best, number is bigger" . Concepts like "ok, all previous stuff works but new stuff only works here". Such crazy concepts. The GBC was a flop because GB already existed.
The legends of the poophole loophole are still spread to these days.