The minimums hardly make these plans "Luxury Plans".
The (very good) reason to have minimum coverage requirements is to push people from burdening the acute care system (ERs).
This is necessary in order to keep overall health costs in check. We cannot, as a society, continue to have people rely on ERs for their only care.
Some of the lavish coverage that is now required[1]:
* Blood Pressure Screening
* Blood Sugar (Diabetes) Screening
* Cholesterol Screening
All of these things are precursors to chronic (expensive) conditions. It is much cheaper to manage these things before you develop heart disease or diabetes. Mandating coverage for these things is simply the smarter allocation of resources than treating the end-stage disease.