That's probably a cultural thing. Being French, raised next to the German border, married to a Belgian, I must say that our tradition of cooking twice a day (even in the evening, when time is more limited) is quite French. I work in Luxembourg and most German and Belgian people I know will eat a "cooked" meal once a day, and eat bread with something for the other meal. It's very frequent to see them bring a "tartine" for lunch, or the opposite. My wife works in a German company where people could come all over from the headquarters in Austria and bring bread and ham for lunch. Meanwhile the French go eating in restaurants nearly every day even if they know they will cook something elaborated in the evening. My dad, 100% pure French, always needs to cook something, and finish the meal with some mandatory cheese.