While her tone and delivery might lean a little bit into the sultry or sensuous style, saying it's akin to 'phone sex' and that you have to mute her really comes off as crude hyperbole. She does a terrific delivery and is one of my key enjoyments of the game, and I have never found her tone of voice unfittingly sexual. It's just her voice. Go listen to her outtakes and you'll see this is merely how she sounds when she's talking calmly. It's a storytime voice I'd wager most kids would find intriguing.
Saying they ought to have gone for a rugged old man voice or a different voice-actor is personal preference. She's gotten a lot of well deserved appreciation for her BG3 narration though.
