People only mode on stickup cam battery with solar power

Why is people only mode not available for stock up cam battery? If the answer is battery usage, I have all of my battery cameras hooked up with solar panels so as to not worry about power at all. Ring should check for this and enable this option right?

I would like to know this as well, as i have set up a camera in the backyard and when putting clothes outside it detects the motion of the clothes swaying in the wind.