It may partly be simply because in Star Trek the ship's computer had a female voice. I would guess that many companies do not actually put a great deal of resea

It may partly be simply because in Star Trek the ship's computer had a female voice. I would guess that many companies do not actually put a great deal of research into selecting the voice, but go with what is familiar without wondering why it was historically done that way and whether or not it was a good idea. When you do research it, there are valid reasons to go with a woman's voice. But I strongly suspect most companies do not actually put substantial resources into the decision.