Agreed about iMessage. Didn’t mind deleteting my Facebook and Instagram accounts (with couple of hundreds of followers) but WhatsApp is almost a requirement in some respects (work, school, family over seas). Would love to get rid of it ASAP for a product from a source I can trust... wish Mozilla were in the messaging business...
Ditto, I was pleasantly surprised to see a huge number of people at work / industry acquaintances already on it when I switched it to my default SMS app. I love how SMS/Signal are seamlessly together in one app if you choose to combine them.
Signal requires a mobile phone number. The iPhone app isn't bad, but it's buggier than Messages and doesn't rotate. The desktop app has the usual Electron problems.