It sounds like you are an outlier. Believe it or not, it’s still one of the most popular messaging systems in the world. People send 23 billion text messages every day.
My job in life are public facing, so it is absolutely essential, whether I like it or not.
Tuta is pretty good and secure but not as fully featured as other providers. For example, there is no way to bridge your email to the client of your choice last time I checked. Still, their client is pretty good. Guess it depends on your needs.