Is there a reason maps are flat?

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I mean, if you think about it, the swamp is the only map that has land elevation, it's in the corners of the map but at least there are. The swamp is one of the most awaited maps due to the graphical rework.

I wonder what is stopping BHVR from making maps like this:

This is only an example, it is obvious that it is more difficult to make a map like this, but why can only the swamp there be elevated?

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