Most people can buy drugs cheaper than you can pay for the Part D prescription drug charges, unless they are extremely ill and taking horribly expensive drugs. The average charge for the Part D plan is about $250-400 per quarter, over $1000 per year.
With Walmart’s $4 drugs, and the coupons you can get online...it’s stupid to pay for Part D unless you take drugs without use of coupons or aren’t covered by $4 list of most drug store lists.
I agree with your basic premise.
But FReepers should also realize you pay a penalty if you sign up for part D AFTER your initial eligibility date. And the penalty increases for each month of non-coverage.