> its a buggy method, considering canada also uses +1, and a bunch of countries look like they use +1 but dont, like barbados +1(246) using what looks like an area code as part of the country code.

You are correct that ITU code is not specific enough to identify a country, but I'm sorry, +1 is the ITU country code for the North American Numbering Plan Area. 246 is the NANPA area code for Barbados (which only has one area code) but as a NANPA member, Barbados' country code is +1, same as the rest of the members. There is no '+1246' country code.

There's not a lot of countries that are in a shared numbering plan other than NANPA, but for example, Khazakstan and Russia share +7 (Of course, the USSR needed a single digit country code, or there would have been a country code gap), and many of the former Netherland Antilles share +599, although Aruba has +297, and Sint Maarten is in +1 (with NANPA Area code 721)