Your just being silly here Stefan. Have I or any other person in this thread talked about 'continuously monitoring a display to the point of ignoring the road'.Well, if I had to, I would immediately buy a HR armband and set my Vado to "assist me to keep me at given HR". It seems more practical. (I'm finding it difficult to watch the bike display or the smartphone for the whole time during the ride, as observing the road in front of me is more essential). The reason I'm not buying the Polar armband is I don't want to be totally "robotised" by the e-bike
If you really want to get technical about it, the CA doesnt allow human power to be displayed on the main screen. I also have the screens setup so that after a few seconds, any screen I changed to will default back to the main screen so what you seem to be implying isnt even possible with my setup.
In reality, I use the average human power to 'spot check' during a ride. I record this in garmin connect along with heart rate data (recorded automatically). If garmin would provide an average heartrate during the ride like it does post ride I would use that as well.