The IRS system is, by far, the worst I've ever had to deal with, and in this I'm comparing the US to countries like Rwanda, where, for some weird reason, I'm also required to pay taxes.
Getting an ITIN (sort-of like a SSN, except you're not supposed to use it like that, otherwise they will send Ted Cruz after you...) is an absolute pain, mostly because you can only request it by phone, and literally nobody you talk to is able to spell your name right, DESPITE you repeating it endlessly in just about any spelling alphabet possible.
So, you now have a dozen-or-so ITINs (again, like SSNs), all in different names, none of them yours. So, you file your taxes using the ITIN in the names that is closest to yours, and specify this on your tax forms.
You send in your forms, and your check, which is cashed immediately. Repeat the next year, and so on.
Now, after FOURTEEN years or so, you get sent a letter, informing you of a tax audit, and demanding you are physically present in Austin, Texas, two weeks from the postmark of the letter (never mind it reached you three months after that, and never mind you're located in Europe, which at that time was denied access to the US due to COVID-19).
So, you get a lawyer, which costs close to US$ 8000. The lawyer contacts the IRS, which continues to insist on an in-person interview in the past.
So, now you're out US$ 8000, and can never travel to the US again.
But, yeah, lovely that they now allow additional login tools...