Half of my vehicles are RWD only, and my roads are very rarely plowed. No big deal most of the year...

Of course, when it snows, it's diffferent, but local geography means if it's snowing enough to matter and the plows haven't gotten around, it's not worth it to be driving, regardless of drive configuration.

If driving throw unplowed roads with snow and ice is a regular thing for you, sure. But lots of people never drive in those conditions, so AWD adds weight and complexity that's unnecessary. But people like to be prepared for everything.