Taxes are genuinely quite complicated in many countries (Germany's patchwork of feudal church obligations, diffuse taxing authority spread over multiple layers of government, and "temporary" taxes lasting over a century has some fun surprises, e.g.), and almost nobody ever voluntarily reduces the tax code's complexity.
What really sets the US apart is 1, very few other countries manage to witness so much criminal energy getting put into legislation without simply collapsing.
What really sets the US apart is 1, very few other countries manage to witness so much criminal energy getting put into legislation without simply collapsing.