I don't really get it either, the whole rapt attention cult-like fascination thing.
The French phrase diseuse à voix for certain cabaret artistes is pretty close to what she is doing, and if you look back at her youth, decades ago, she was in fact connected to the French songwriter Serge Gainsbourg
...no, she was not one of his "muses" or ladies that moved in with him, but he wanted her to sing his songs and she may have recorded one called Hier et Demain.
You may or may not be aware that Marianne Faithful was stricken with COVID-19 and survived, thanks to being treated in hospital before it was too late. However, her producer, Hal Willmer, succcumbed to COVID-19 last year.
So her latest release (don't know if it's out yet), "She Walks in Beauty", was produced by someone else. Already there is a published interview at Mojo magazine in aid of the album.