> The challenge is that you personally need to report additional information for things like capital gains tax on asset sales, any credits/deductions you wish to claim, and changes in your living arrangements or life status.

One could argue that a basic principle of liberalism ought to be that if the government wants to tax you they should be responsible for calculating how much you owe according to the law. Or in other words, for every dollar the government doesn't demonstrate that you legally owe, you should not owe that dollar. Kinda like presumption of innocence, but for taxes.