easy solution, stop filing taxes. The government gets all that information anyway.
Not true. First of all, you may have accounts outside of the country, which you will need to report. Second, you may have rental income that is not automatically reported. And those are only the first two things I thought of when I read your post.
Oh, and those are Federal only. An example of state taxes that are not automatically reported is the use tax that you have to pay if your state uses it, like California does.
The IRS also doesn't necessarily need to know about your deductions, unless you want your doctor to inform the IRS every time you visit the office, and perhaps you'd like your kid's preschool to inform the IRS that you prefer the Catholic Baptist Imams Kiddie Academy instead of your local preschool. And let's not forget deductions like home office or certain business expenses.
I'm pretty sure that in order to have everything go automagically, the entire tax system would need to be overhauled.