Nowadays, a majority of apps require you to sign up with your email or even worse your phone number. If you have a phone number attached to your name, meaning you went to a cell service/phone provider, and you gave them your ID, then no matter what app you use, no matter how private it says it is, it is not private. There is NO exception to this. Your identity is instantly tied to that account.
Signal is not private. I recommend Simplex or another peer to peer onion messaging app. They don’t require email or phone number. So as long as you protect your IP you are anonymous
I’m ready to be called milquetoast, and while I see where this comes from, it comes off idealistic if we are to communicate with people in the present day in any practical way. Do not forget how much of an improvement it already is over the likes of proprietary messaging apps and how much effort it already is to move people to Signal. It is surprisingly difficult for common folk to grasp the concept of anything but a phone number when it comes to messaging apps.
Which definitely begs the question of why people put any effort into trying to move any of their contacts to signal in the first place. I believe the answer is that they didn’t value privacy either. Just the idea of it.
Indeed, those who don’t have older friends totally underestimate how confused the oldies get by the concept of an alternative phone/messaging app.