In Cyberpunk, they used Cherami Leigh for V, who was probably best known for voicing Asuna Yuuki (female lead) in Sword Art Online. I think that series is "why" she's V in the same way The Matrix is "why" Keanu Reeves was Johnny (a role written for David Bowie). But, other than The Dark Tower, I can't really fit Idris Elba into that analogy, and that movie sucked (I liked it, but as a reader of the books... it was shit). The Matrix needs no introduction, but Sword Art Online also dealt with themes of being trapped in another world, much like Johnny was in the "soul prison". Especially in the third and fourth seasons, where they got into time dilation (perhaps more popularly explored in Black Mirror and Interstellar). A roundabout way of saying, her resume made her appropriate for the cast.

The guy — I forget his name — sounds like he's from New York. He's actually a good voice actor, I don't have a single problem with his performance, or at least I wouldn't if Night City was New York City... instead of (near) Los Angeles. I think Cherami Leigh is from, or lives in, California, but her V voice is nothing like her Asuna voice. You can kinda hear it sometimes (like that awesome Corpo V line when checking into Konpeki Plaza ("did I ask you to think?" ... "next time, just do as you're told")) but mostly, she's speaking more lowly, more sultry. For a person whose personal motto is "love and light," it doesn't seem like a good role for her... but she killed it. (She also narrates the audiobook of the novel, which isn't about the Johnny story, but rather is just set in the same world. No something. Escape? Excuse? Something like that. It's a good story. At least as good as the Edgerunners anime.

As for Witcher 3... Wandering in the Dark? Tried to find the quest you meant. I've done that one. I didn't mean the witch you can hook up with, I meant the witch in the swamp. But, I've done both. I recall it being annoying and I hear you on "where a lot of playthroughs go to die," but it's not why I took a break.