I didn't say "not costumer facing", I said "invisible". A lot of important work is something a customer will have no idea exists until it goes wrong. If you've done your job right, it will remain invisible forever.

Because it's invisible, what's the point of arbitrarily shipping it in one-to-two day chunks to "gather user feedback"? Be willing to take the time to do hard things right. I'm not proposing you spin your wheels for ages on something, and I'm generally in favor of shipping early and often, it's just trying to fit every different shaped problem into the same process that doesn't work for me.