I grew up in one place with a very marked accent, and moved later in life to a place with another distinct, very different accent. My accent shifts within minutes of talking with people from either place. Sometimes I'm in a room with people from both places, and my accent changes depending on who's in my field of view. This doesn't take any effort; in fact, I need to make an effort to avoid it.

This is how accents work. Our brain adapts very quickly to try to fit in.

(I grew up in Buenos Aires and now I live in Madrid)

That said no it is not particularly important. But striking and memorable. The voice is the most striking part but I don't think it would land with me if not for also the turtleneck and the other Jobs knockoff stuff.

The point being people have different ways of speaking to different people.

Maybe another example is Hawaiians talking to each other vs to tourists

For her voice register change, where's the line or the gray area? It's a very personal human thing. I find her to be oriented around how she presents herself and how she is perceived. Then she uses her impressive talents to guide and manipulate.

I find her unnerving but also a great example of how the eyes are really part of the brain.

[edit: a lot, same general idea but composed bester[

let's flip it on its' head; she's now seeking sympathy and understanding from the public and her voice softened: Does that aid perception of truth and honesty? It doesn't for me.

Using deeper voice as a result is like putting on suit and making your hair - adjusting yourself to societal biases.

The issue with Holmes is not voice or cloth or whatever. It is fraud, lies and lack of care about harm she caused.

Care to finish that thought?