Lennon, Tesla, and JFK were deeply flawed human beings living in a different time, with far less media coverage than today. I suspect your view of the past may be unfairly rosy due to the effects of time.
Billie Eilish is simply the current incarnation of the "breathy misfit 'poet' girl singer" that comes around over and over and over and over. And then disappears.
I hope she makes an enormous amount of money while she's popular and has a smart enough brain to bank it for when she is not.