Sarcasm aside, you really aren't that far off. Unfortunately, we as enthusiasts don't make the decisions - our own social networks (the concept, not the internet shitholes) do that for us. The vast majority of regular people don't even realize you can use a different texting app, let alone a secure one that doesn't rely on an insecure protocol (i.e. Signal). And then you have iPhone users who don't realize that iMessage is a wholly separate thing from SMS. You can't really expect those kinds of people to download 4 different messaging apps just to keep in contact with their peers.