I agree. If it became a management or surveillance tool, I'd find that pretty uncomfortable.
I was thinking more about helping the individual in situations where they genuinely want to pay attention because the meeting is important for the work ahead, but still catch themselves zoning out.
Fair point, but then again, what's the difference between intentionally being passive cause the meeting isn't relevant, and actually wanting to pay attention, and finding out that you drift off without noticing, i'm more interested in the second case.