Okay. Hypothetically speaking if you are right (I'm not a CPA), then the old system that the IRS looked past, let people treat it this way because it worked and didn't fuck people over.

Pre-$600 BS, you could sell some of your used stuff (a TV, stereo system, etc) and wouldn't have to file it for taxes again. Example with new system that likely hits more people: When you bought that TV/Stereo/etc you used your income which they was taxed. Then when you sell it off used, they want to tax you again. You're being double taxed on your income. And this ignores sales/use tax as well.