It is stupid. Yes, technically the models are bigger but the consequence of that is that it also makes things in horizontal axis appear to move much faster so hitting moving targets is more difficult.
Last time I've told a joke to my therapist I've ended up 3y in a court room so I don't recommend jokes either
It's not turned ON by default. It's just there as an option, you are opting in to use it if you want to use it.
What's the default height of combat? What makes it more tall?