Earlier quoted context omitted.
Being implacably stubborn is underrated. People can trivially have two messaging apps on their phone, which means they can all still contact you while using WhatsApp with other people. Then they all slowly end up with Signal on their phone, at which point who needs WhatsApp at all? "The reasonable man adapts himself to the world; the unreasonable man persists in trying to adapt the world to himself. Therefore all pro…
Yes, you can have two messaging apps, but people will have a “main app” which is typically the one used by important people in their life (family, partner,…) and/or the one used by most people. Meanwhile, if you all use two apps, everytime you want to check up on a friend you have to check two apps. Imagine all your friends love pizza, as do you. Suddenly you decide sushi is better so, naturally, you tell your friend…
You just have to check the one they use. Also, both of the apps would support notifications when something has happened in that app.
> But what if they don’t like it that much?
There is no real advantage of WhatsApp over Signal except that some people are already using it, and a significant privacy disadvantage. Once someone already has Signal then the advantage of WhatsApp is gone and only the disadvantage remains.