If I disagree, I can add/remove/update it. If I agree, I just file
Asking me to collect those documents and reports the different numbers into a form, is not efficient, error prone and time/money consuming.
Exactly. That’s why they want you to do it and not them.
It's marginally more work for them to tell you the results of their math. And compared to how many people file taxes it's a net benefit for society. Collectively paying a small group of people to do something for the benefit of many is like the whole point of government.
I don’t know that for sure that.