They said a status board on top of their monitor, not every corner of their house. This seems like a very unobtrusive signal to me. Plus, some people like to hide or obscure their phone from their field of view during work, to minimize distractions. Honestly, the only person I immediately check my phone for is my wife. If I could have a priority indicator along with that, I’d love it. There are some things I need to know immediately (a kid is sick and one of us needs to pick them up, etc.) regardless of what I’m doing, and there are others where it can wait until I’m done with a meeting.