that’s a common talking point, but that is not exactly true. they don’t know how many dependents you have, if you are eligible for certain tax credits, whether you use your home as a work location, etc., etc.
If only there were a way for you to tell the IRS how many dependents you have. Seems like we should just scrap the ability for folks to fill out anything and let Daddy Intuit do it for us since we're all so helpless with our taxy waxies.