What reason are you referring to?
I can understand where you're coming from to be honest. I have used a hack before on several Call of Duty games for 3rd person and I didn't like it. Yes it's obviously not designed for that, but even if it was, I still would probably stick to 1st person. (And this is coming from someone who prefers 3rd person)
In the original Star Wars Battlefront II I can remember switching to 1st person instead of 3rd and I didn't really like it either. Especially since you have the scope view on guns that don't even have scopes, which is weird.
Still, considering people have different preferences and being able to appease both sides is in my opinion a step in the right direction for any shooter game.