I don't think this is particularly true, a lot of pop music is very hard to pin to a single key if you analyze it strictly through the lens of western art music

I don't think this is particularly true, a lot of pop music is very hard to pin to a single key if you analyze it strictly through the lens of western art music theory. You end up having to say weird stuff like "well the song is in one key but the chorus is in another, but with the third borrowed from the first key, but that note is left out of the final chorus..." when "it just has two roots" is a complete explanation. It's not even "modern," people still sit around arguing about which key certain beatles songs are in, when again "more than one" is a more useful explanation. And I mean I know you know this but for other readers: music theory isn't like a math formula where song goes in, answers come out. It's a practical framework and a vocabulary for communicating about music, and evaluation of a successful analysis has to be based on the usefulness of the evaluation. There can be multiple "correct" analyses of the same piece of music, with different usefulness to different people at different times. Pop music has influences from outside the mainstream european music traditions, and so certain assumptions that almost always make sense within those traditions (eg songs have a key, with a tonic) will lead you to goofy places sometimes.