Retirement savings is tax advantaged, however most people consider that a feature of the tax code, rather than a loophole. The traditional to Roth conversion will be of benefit only to those whose post-retirement income puts them in a higher tax bracket than they are currently in. Most middle-class wage earners would not be in that category unless they keep working well into retirement age.
Health Savings Accounts are highly dependent on the circumstances of the individual. Many people with employer-provided health care plans receive minimal benefit from an HSA.
That being sad, you've made you point, in that there are portions of the tax code with deductions accessible to the middle class, like home interest deductions and deductions for charitable giving.
But the, "I'm going to start 12 shell companies and park my money offshore" kind of tax dodges are not really feasible until after your first ten million.