If this sounds like your week
On a shared screen, a private timer helps no one.
In a pairing session, a screen recording, or a timeboxed review, the clock only coordinates people if everyone can see it. A tray icon on your machine is invisible to the person on the call, and a timer on your phone is off-frame entirely. The one moment a shared sense of time matters most, it's hidden.
Where tooling usually breaks
If only you can see the clock, the session drifts for everyone.
Pairing blocks run long because no one in the room shares the same view of how much is left. A screencast overshoots its target length and you only find out in the edit. Someone ends up volunteering as the human timekeeper, which means they're watching a clock instead of doing the work.