The information relevant for the vast majority of taxpayers, including the vast majority of people on HN, is already reported. What this is talking about is all the avenues that aren't open to most taxpayers which are used for tax evasion.

The more relevant part is actually funding the IRS at a level capable of doing its job after decades of systematic gutting. Oh, and if we could actually simplify the tax code and fix the data collection we wouldn't need as many resources in the first place.