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A studio camera does not need an integrated grip. An architecture camera does not need an integrated grip. A landscape camera does not need an integrated grip. If you want a grip for those purposes, attach an optional one.
Canon already makes a camera with an integrated grip for sports, photojournalism, and some wedding photographers.
A studio camera doe NOT need 6fps, an architecture camera does NOT need 6 fps, a landscape camera does NOT need a 6 fps.
If you want frame rate, you buy the optional camera for that.