For most individuals (as opposed to businesses), the only relevant taxes for the tax return are federal and state income taxes. Even then, there are several states in the country that have no state income tax, so you end up filing only the federal return. I live in such a state, and I still find the system very convoluted compared to what I've seen elsewhere.

Most crucially, it's still unclear to me why a return has to be filed at all for any tax that is already paid (from wages), and why it has to be manually compiled in cases where the agency has all the information about taxable income. If I don't owe anything, I shouldn't even need to file anything. If I do owe taxes, send me the forms prefilled and let me either sign off on them or add any missing info as needed. Anything over and above this is just pure waste of everybody's time and an opportunity for parasites to profit.