By your definition of the middle class, a healthy U.S. economy would need approximately 4,000,000 domestic maids to satisfy the biweekly maid service requirement.
I have certainly done this same work myself. It is an excellent position for people without many skills and/or the desire to pursue education. And it is not an appropriate use of time for those of us who do have more skills. Therefore it is highly reasonable and efficient to outsource these tasks to those unable to make things or to design things, and/or not motivated for whatever reason to seriously pursue and master such tasks.