Possibly, but the real world is likely nowhere near that. I’d be willing to bet most people in general don’t leave their phone lying around their house randomly while they’re home and actively doing things where they might need to login to accounts. More likely their phone is in a pocket, or on the desk in arms reach, not the other side of the house while they’re on the computer.

And of course all of this assumes a phone only app or a text message while ignoring the systems that let you access your messages from other devices. Like the iOS/Mac support through an Apple ID, Android Messages supports via the web, and Phone Link on Windows will let you do as well over WiFi at home. All of those will let you access your phone messages without needing the phone directly in front of you.