Cooking really spicy food can cause everyone in the house to start coughing, even those who love eating spicy food, and even with a decent venting system. Then there is sea food, many preparations of which are going to smell like sea food no matter what you do. Or there are just recipes that involve lots of fish sauce (or any other heavily fermented sauces).
Baby octopus fried in fish sauce stink, even with a vent fan.
Plenty of dishes, and entire cuisines, need good ventilation.
Maybe you're making really mild "Indian" food haha. I'm Indian and if we're making anything remotely spicy, we're dumping lots of hot stuff in a tadka or pan frying it, which is not only unpleasant elsewhere (read: eye watering and cough inducing), but sometimes prohibitively much for the person doing the cooking, if the ventilation is inadequate.
Baby octopus fried in fish sauce stink, even with a vent fan.
Plenty of dishes, and entire cuisines, need good ventilation.