Your real kitchen is outside the house...
...and is as big as half the house.
We cook a lot, and big. We feed hundreds of people, and sometimes thousands. Not a parish; not an association. Families feed hundreds and sometimes thousands. So big kitchens, outside the house proper, is the rule.
Cooking for hundreds can be messy. So - outside cooking makes sense.
As for the indoor kitchen. Well, maybe we could consider it a museum. Look, but don't touch.