FWIW, I mentioned it in my "how did we do?" response, and did get a (form) reply...
Dear Mr. danM:
We appreciate you taking time to share your thoughts about our services.
We're sorry our products didn't meet your needs, and your comments are very helpful to us in understanding how to improve your travel experience.
We look forward to working toward the suggestions you've mentioned, and to welcoming you aboard your next flight. Thank you for your MileagePlus Premier Gold loyalty and business.