This is exactly what HRBlock and Intuit currently do. They have hooks into all the payroll processors and investment companies and will download your W2s and any 1099s from the relevant company. Then you just answer a bunch of questions.
The problem is that a private company shouldn't have to offer this service. The government should do it for you for free because it helps them get their money faster and easier. However, as the article and others noted, those private companies realize this would be very bad for their business and have lobbied to stop it.
The problem is that a private company shouldn't have to offer this service. The government should do it for you for free because it helps them get their money faster and easier. However, as the article and others noted, those private companies realize this would be very bad for their business and have lobbied to stop it.