to cut through the necessity of VOs in anyone's mods?
IMO Voice acting is not essential except for a limited number of genres, such as Horror.
This might be the acquired bias from years of cRPG fandom talking.
you could even use other canon voices, like admiral Petrarch or whatever.
Maybe this is something that has been in your minds since ages, and I'm an idiot for bringing this up, I'm just asking where your thoughts are on this.
I would consider that application to be unethical. It is one (acceptable) thing to substitute an actor with another for a role; after all the role does not belong to the actor, it's their interpretation of the role that does.
However using technical means to mimic another person's voice
without their consent is a different matter entirely. (If consent is given, the matter is changes significantly - it would acceptable but aweful, and recasting would be preferrable.)
For one, not recasting is to essentially deprive the actor to be newly cast of an opportunity. Secondly, this has the potential to narrow the range of performances you present to your audience.
Thirdly, (its a different argument so it has to be) Additionally, actors can be a great source of feedback, esspecially when it comes to sensitivy in writing. Having them alter or refuse a line and then to engage in a dialogue about said alteration or refusal can make you a better writer.