Use whatever works best for your life. I’m just sharing what I do. I had to walk my 80 year old parents through how to use signal but they now call me there. My spouse still complains to this day about having to text me on a second app but they do it. I still have a regular phone number for 2FA and what not but I only check my messages once a day. I insist that my communication channel has to be encrypted and set disappearing messages for everyone. It’s amazing how many people fall in line when you set boundaries and enforce them. There are a handful of people that I rarely talk to because of the need for a second app but I consider that signal rather than a loss.