Yes, it makes no sense at all. It's akin to a business which provides you services asking you to prepare an invoice yourself, then sending you an invoice along

Yes, it makes no sense at all. It's akin to a business which provides you services asking you to prepare an invoice yourself, then sending you an invoice along with a fine if you missed something. They already know everything relevant about you (except perhaps donations and such, which you can fairly easily tack on) so I don't see why anyone would prefer the current mess that we have to deal with. It doesn't help that state taxes are non-uniform and weirdness often results if you live in one state and work in another, for example.