I think the advice for going dark is to respond to texts about childcare and finances if your spouse asks a direct question. Then you answer the question. You're not making them think you've gone missing, you're just taking away all the parts of the relationship that are about friendship, love, family etc, not letting them know anything about your inner world or social life, and keeping it 100% business only. Talk to him like you'd talk to your accountant, in other words.
