Honestly, why didn't they make the Terminator a woman?
See above. They used one in T3, this movie had three other women in it... I think they might as well have gone all the way with it.
In fact, it would have been cooler if they had sent back a Sarah Conner duplicate to fight the old Sarah Conner. I get they don't know what she looks like, but they have taken so many liberties with this concept they can retcon a way.
Some missed opportunities with this flick...