CameraViewport - why is cam height ineffective?

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I'm finding the need to use CameraViewport for the first time. However, I find it somewhat erratic.

Why is camera height so ineffective (ie PositionEntity cam, 0,30,0)?

After much faffing about, I found more joy from CameraZoom. However, this seems to be a balancing act between the two.

I spotted the bentness when I decided to scale down the size of my entities. Low and behold everything was fine. However, I deem it should be just as easy to set the camera up (with my chosen entity scale) as it is to scale the entities down just to get a logical view.

I don't like it.

Why is the actual height of the camera virtually irellevent? I find it annoying.