This is both an efficient use of existing code base and increasingly a requirement as developing nations struggle with limited resources to tackle similar challenges.
This would boost productivity by making the tax code more efficient, while shifting more of the tax burden to the rich who now benefit disproportionately from such exemptions and account for Mr Buffett's sub-secretarial tax rate.
Like most complexities within the United States tax code, the alleged positives tend to be less efficient or less certain to realize than some of the obvious negative consequences.
As more of these special preferences have been added to the tax code, more decision-making in our economy is tax-motivated rather than economically efficient.