I think it's more that they have a bare minimum that they spend with each other, and only each other, with no exceptions. Too many couples spend hours together, but watching TV, or cooking, or any numerous other activities that distract them from just enjoying being with each other.
I'd argue that watching TV together and cooking together are entirely different things. Passively watching TV and never talking is awful. Cooking together should involve interacting, talking, asking questions, conversation, etc.
