Earlier quoted context omitted.
In addition to the penalty you'd incur, the IRS is unlikely to dig into your deductions and credits with your fervor, so they will likely compute a number that is "quite suboptimal". There are also multiple ways of doing things, and picking one path may be strategic to you (if you expect more or less income in the following years). Giving up on this flexibility and its ramifications will affect your outcome negativel…
I think the general idea would be for the IRS to provide you with the completed tax return. This should be sufficient for a vast majority of people who only earn employment income. You would then review the return and could update/file a return if you have additional deductions or business income that would not otherwise be reported to the IRS. I believe the UK and some other European countries already have this syst…
The government favours them as subsidies at point of purchase, rather than something you do at the end of the year. That actually works out a lot nicer as a tax payer, as you don't need to have the full amount of money up-front, and also means you're way less likely to miss out on some of them.