You understand, though, that there’s approximately seventeen million things one could fill in the blank of “does the world really need a _____”, besides this? And a lot of them would be less worthy than this. Including a lot that have already been filmed and released.
Wikipedia has a page for the awards she’s received. It goes on for... a while. It includes a pile of Grammys. She’s not just a little bit popular, she’s something of a phenomenon. Yes, she has one album. At one point, she had 14 tracks in the US Hot 100, 12 of them from that one album. That’s pretty impressive.
I’m not the target demographic for her music. But I really like some of the things I’ve heard from her. I wouldn’t mind a documentary about her. If you’re gong to make a solid case for this documentary being “not really needed”, maybe you should start by tackling thousands of more frivolous documentaries that have already been made?