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It would seem to be difficult to rework the way a combustion chamber is designed to work. They engineered it for a particular swirl and a certain flame spread, etc, and to change this after the fact would seem problematic. If you disable one intake valve or the other, and one exhaust valve or the other, you have a profound effect on the mixing and flow. In other words, the valve sizes and their placement and the shape of the chamber and the placement of the spark plug, that would have been better if it was designed for a 2 valve or a 3 valve to begin with, are very hard to get from a 4 valve design.
Also, the fuel metering and the intake and exhaust tracts are all designed for the flow through the 4 valves. It's hard to change any design, unless you can change all the things that are involved.
I see you've come to basically this same conclusion - it makes sense to me.
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