If you have smaller fish then giving them a nook or cranny to hide/sleep in will definitely be appreciated, but you don't need to build mount everest to achieve this. Even one porous boulder can house lots of small fish.
For my tangs, they are ok under an overhang, although I do have an open(ish) cave area that they retreat to as well.
Also, an open aquascape doesn't necessarily mean sparse. You can have a decent a mount of rock in there with nooks and crannies and even caves, while still maintaining an open aquascape with lots of negative space.
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