In France too, most kitchen are optimized for looks with an island and fully opened to the living room. If you use noisy equipment, it makes both places uncomfortable. But I think that's the point, it doesn't happen that often.
There are not a whole lot of people who actually cook anymore and those who do deal with the annoyance or have their house choice influenced by that requirement.
I think complex home cooking is a vestige of the time when there were middle class housewives with a lot of time to actually do that. Nowadays with both parents working, cooking has been relegated to an activity that has to be fast, easy and efficient; which is why those multifunction cooking appliances are so popular. You never get something great out of it but it works decently enough to have the person responsible take care of some other errands simultaneously.
So right off the bat, you're down $20k at least to remodel the kitchen so it has proper ventilation, assuming you cook.
Forget the health effects and whatnot, but are people not bothered by cooking smells pervading the house?
Personally I would prefer a Chinese style kitchen with a fully enclosed cooking space (sliding glass doors to leave open if desired) and exterior ventilation. It keeps the worst of the aerosolized oil contained and away from the rest of the home.
Being very honest, no, not really. From all the issues I can encounter in a house the smell of a meal cooking is not one of them.
On the flip side I am thinking about anything with high heat, meats and oil. The food will be delicious and the smell of the food is great but the smell from the cooking process is miserable and will linger.
Baby octopus fried in fish sauce stink, even with a vent fan.
Plenty of dishes, and entire cuisines, need good ventilation.
Cumin, Turmeric, hot onion and garlic just fragrant, butter, creams...
What do you think food should smell like? Boiled chicken? Do you have sensory issues?