Just because you can't come up with any examples doesn't mean that other people can't. You aren't the only person capable of thinking of examples.
Some examples:
It's useful to know when you have arrived home and are no longer moving.
It's useful to know when you have started moving and left home.
It's useful to know where your home is so that it can guide you home and for other traffic related reporting reasons listed above and below.
It's useful to know where other homes are or other places you spend time, where it may be significant that you are arriving and staying for a long time, as opposed to for just a minute or two (as at a traffic light).
It's useful to know that your non-motion is not an indication of traffic being stopped on your road.
It's useful to know that non-motion when you are away from your home may be an indication that traffic is stopped on the road you are on.
All of these are directly relevant to explicit, openly featured Waze use cases.
Some examples:
It's useful to know when you have arrived home and are no longer moving.
It's useful to know when you have started moving and left home.
It's useful to know where your home is so that it can guide you home and for other traffic related reporting reasons listed above and below.
It's useful to know where other homes are or other places you spend time, where it may be significant that you are arriving and staying for a long time, as opposed to for just a minute or two (as at a traffic light).
It's useful to know that your non-motion is not an indication of traffic being stopped on your road.
It's useful to know that non-motion when you are away from your home may be an indication that traffic is stopped on the road you are on.
All of these are directly relevant to explicit, openly featured Waze use cases.