It's all about the context, though, isn't it?
Assuming you're living in a terraced house with a small garden at the back. When the baby has a daytime nap (thank goodness mine often did 2-3 hour stints without fail), would you not go out into the garden with the monitor whilst they're sleeping? Or would you be waiting anxiously outside the baby's door perhaps?
So, say you would go out into the garden (with the monitor) - would you then not do this evenings as well? Shouldn't be different?
Similarly, assuming your next-door neighbour (in this row of terraced houses), has a garden with a gate between you or a way to get through to each other garden's, i.e. just a few centimetres away from perhaps your own garden table is or kitchen/diner (assuming at the back, overlooking the garden). What is the difference?
Obviously if you're in a large detached, with a big distance between your gardens/kitchens etc it's very different.
People seem very 'stuck' in their thinking rather than looking at context.
I'm assuming most people would have their baby in its own room at aged 1 and would be sleeping in their own bedrooms at night? That is potentially 10 hours of no supervision (apart from maybe a monitor, a more recent invention)!