Question : Do you know how Norwegians fill out their tax returns?
Answer : They don´t.
This is an oversimplification, but years ago Norwegians started to get pre-filled tax returns in the mail. Later they stopped getting them, but instead had to do an OK online. Now even that is not needed. No comment means it is is OK. You can rectify and modify details online, if needed.
The reality is that the government already had most of the data needed for most individuals. Your salary is reported by the company you work for. Your bank details, including anything you have in your accounts, any loans, stocks, bonds, etc., is reported as well. Your kids are known as well. There might be details to add, but most is known. Why waste people´s time filling out details that are already known and risk people making mistakes?
When will the US get there?