I think it just has to do with a complete lack of building code requiring them so they are a total afterthought. I also feel many people dont really cook at hom

I think it just has to do with a complete lack of building code requiring them so they are a total afterthought. I also feel many people dont really cook at home anymore so even less reason to have one installed. However, two friends who love to cook or have an SO who does have had full outside vented range hoods installed when they remodeled. One is so serious they have a commercial hood over a 6 burner stove. That guy brings his own lunch almost daily complete with their own fresh baked bread. His SO has a library of cookbooks and enough kitchen equipment to feed an army.