It is fair to say that it might not be entirely NicAR’s fault how the integration process ended. If you are not up to date with Argentina’s affairs, I can tell you that there was a change in administration, a modernization entity was put in place and the authentication end ( AFIP ) is a process and UX hell on its own, so as this project might be a few months old I would give them the benefit of the doubt and expect this flow be revised in following iterations.
AFIP is currently a mess and I’m pretty sure they are busy enough not to improve the authentication side under NicAr’s schedule.
My two cents.