For a truly uniquely complicated tax system please move to Germany.

While I fully agree that there are a lot of complicated rules for edge cases, for simple (non self employed) cases it is very straightforward. In fact, you don’t have to do anything at all in many cases and still won’t be screwed over as the German IRS will assume typical deductions. There is an official free filing software and if you spend 20-30 USD a year you’ll get access to super easy to use professional filing software. My situation is more complicated than most and I spend 2hrs a year for my entire family

Why stop there? If you reside in multiple countries, then it really gets fun.