I question the idea that the government could build better tax prep software than Intuit or other private companies. I don't think the Feds are known these days for performant, efficient, easy-to-use large scale consumer web applications. At a minimum I think discussion along those lines should wait until federal IT procurement is reformed.
It's also worth noting that the article is not talking about the actual complexity of the tax code itself. As far as I know, Intuit is lobbying on the subject of tax preparation technologies, not lobbying against tax simplification in general. (As some comments seemed to imply.)