I am not sure of the angle as it would vary I suppose from company to company as there is always an optimum range of the angle of the keyboard - that would conform to reduction of stress to the wrist. But for the surface shape of the key-cap, I do believe that the surface area of the key cap is an essential interaction factor to enable users to type effortlessly on the key board. The hit rate of a adept user on the surface of a key cap does vary depending on the shape of the key cap. >From an anatomy perspective, the fingers tips are not flat, but slightly beveled. The softness of the finger tips enable the bevel to become flat and cover more surface area only if the key cap is flat. More surface area in contact would mean higher probability of hitting the right key with the right amount of pressure. If the key cap is not square, but a rectangle or an oval - with a flat surface, it would consume a larger area in terms of placement of the rectangular or oval/circle keys. However, the oval or circular keys would have larger gaps between each key, while the rectangular one could result in longer, or wider or both shape of the key board. Apart from these there are other aspects related to relearning and adoption to the new shape etc which is not cost effective. Hope this helps.
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