It’s not an honesty test, it’s a result of how the US income tax system evolved. Originally the IRS had far less data and everyone filed paper returns. For example, it was only in 2008 that Congress required brokers to track and report cost basis on 1099s to cut down on people overstating their basis to decrease their cap gains.
Under Biden, the IRS tried to make w2s and 1099s available. If you log into the IRS website with your information, you can download the w2s and 1099s the Service has in your name.
Antitax activists have fought these steps every step of the way because the less annoying tax filing is, the less people will buy their antitax arguments.
The IRS isn’t captured by these predatory tax preparers, Congress is. The IRS can’t do a lot on data without Congress specifically authorizing it. And the Republican Party is in bed with the antitax activists who are in bed with the tax preparation companies.
Tax account transcripts have been available long before Biden was president.
Use Form 4506-T to request them.
I think you're misinterpreting the GP's point. Clearly, at least in our current system, it is essential to tell the IRS the parts of the return that they don't already know such as what are your expenses, deductions, marital status, etc.
But the absurd thing is that the capture of the IRS by the paid tax prep scammers has prevented them from simply showing you what's on your tax transcripts and having you click "Agree" or "Modify" for each one. Instead, you get your own copy of the 1099-B, 1099-DIV, 1099-INTs, and are administered a pointless "honesty test" to see if you'll type in the same numbers they have, or be automatically punished.
Obviously, Direct File was ideally situated to offer this feature since IRS has the data themselves, and simply populating the numbers is a highly efficient way of ingesting the data into your return.