I'm not even sure why. Even if the IRS prepared an "initial statement" for you given what they have more than half of the US would (still) have to hire someone to come in and fix everything. I did an IRA backdoor this year and accidentally overcontributed my 401k, my previous years state taxes also contained an error that had to be rectified; my taxes were an absolute mess.
Who tax prep should be worried about is people who want taxes to just be a bill with no exemptions or write-offs. They usually fly that flag under "simplify the tax code".