Since I'm a SAHM, my DH doesn't cook dinner every night (on a regular basis but he does from time to time) and I don't expect him to. Maybe that is the case with the OP and his wife since they already have 3 children and one on the way?
Why do people have be so clinical?
I thought the post was refreshing and sweet. Maybe he just wanted his wife to know how much he loves her and that she isn't being a 'lazy wife'.