Seen it about a dozen times over the years, which works out to maybe every five years since the 60's.
Not her, but someone just like her. Every generation of kids coming up has a "new, edgy, really avant garde" singer. The kids, having no history, flock to her as being totally unlike anything they've ever seen because she blows away the crappy, tired old singer the kids 5 years older then them listened to. She is "theirs".
Madonna, Cyndi Lauper, Britney Spears, Miley Cyrus, Lady GaGa come to mind. That's not to say that some of them (not all but some) actually have some talent, and some have a lot of talent, while others just get noticed for being the latest outrageous, in your face symbol of youthful rebellion.
That's okay, let them have her and let them believe that no one else at any time in history has ever been as cool as she is and particularly as cool as they are for listening to her.
I miss PMJ's earlier singers - Morgan, Sarah Niemeyer, Ariana Savalas and such. Some of the new ones definitely have a ton of singing talent and they still produce some great variations but some of the sexually ambivalent male singers pretty much turn me off. But with a four year and growing repertoire you can still find some good stuff to listen to.
Speaking of, the OP's Billie Eilish's "Bad Guy" as a tango with Ariana Savalas.
Gunnery, gunnery, gunnery. Hit the target, all else is twaddle!
She's strung out on meth or some shyt. "so good" doesn't have much to do with it. Maybe it says something who she was up against in each award category. It's all biased anyhow, just a matter of who was favored for whatever reason. Has zero to do with the talent level of all nominations.
