Having lived in multiple apartments and now back into a house I am amazed that US apartments (at least the ones where I lived) did not have a range hood that blew stuff to the outside. All they did was recirculate air through a grease filter. In other words, useless.
Now back in a house with a connection to the outside. Actually does something.
Although I try to cook outside, because cooking inside means I have to pay for more AC.
Smell. To keep the smells of cooking from overwhelming the rest of the house. In the process of building a new house and it will be a separate kitchen. Well, technically, a wet kitchen that is closed off and a small dry kitchen connected to the dining area for dealing with things that aren't strong smelling. This setup is pretty standard in here in Asia.