To play devil‘s advocate a bit, isn‘t my phone (or laptop) already a universal chat client? I have a bunch of apps for different services. I can see when new me

To play devil‘s advocate a bit, isn‘t my phone (or laptop) already a universal chat client? I have a bunch of apps for different services. I can see when new messages come in on all of them, I can swipe/click to respond, I can control the notification settings.