Reasoning
The option to rotate the camera is just that, an option.
Some people want the ability some do not. If you don't, don't rotate.
This is not a feature that if added you are forced to deal with as it is not an intregral part of gameplay. This is a feature that you either use or don't. Such as turning on high textures or low res textures. It's your choice.
As for performance, it should make no difference, UNTIL you actually start rotating the camera, so if you are worried about a performance hit, don't do it.
Besides allowing you to view the game world at a perspective that you find more favorable, rotating the camera in a 3d environment such as this allows you to find, discover and interact with objects easier. If you are in a battle with a large number of foes in a genaral area, the amount of gear that is dropped piles up. It is not always so easy to see all the items. If you could zoom in and then rotate around the area, finding items would be quicker, and more enjoyable. Just one example.
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