BS. I visited city I grew up recently, met with a few (9+) people (25-32 years old) and only one of them had WA, most haven't heard about Signal, everyone simply uses SMS. It's simply multiplatform, works with their gradmas and no one wants to install __another__ app to send messages to people. No one cases about RCS that will be used to push QR codes and ads, people will use SMS for its simplicity and reliability. I'll be dropping Signal and moving to WA once Signal drops SMS support.
Or (bluntly): why not Matrix (and/or XMPP)? What makes WA so much better that you're willing to go all-in with this company?
I'm not taking anyone with me, they already have Signal and WA and obviously SMS. I'm uninstalling Signal and not recommending it again. I can already message Signal contacts using WA or SMS. I don't need Signal for that, and I'm not keeping 3rd messaging app.
I don't have your phone number. I was talking about my 4 Signal contacts, they are on WA too.
Personally, I use signal as a replacement for Hangouts.
now give me Matrix client with basic SMS support (I don't need even MMS) and I'm installing it immediately to replace my dedicated SMS app
I did same love with family as poster, from Signal with family, WhatsApp and SMS just to WhatsApp/SMS combo though already years ago after PIN nagging