Canon brought to market the Powershot G1X II featuring an in-house odd 1.5" Type sensor.GH5s is highly specialized and very expensive for a small-sensor camera and it's sensor is otherwise much less capable than the one in it's sibling so there were significant drawbacks, and LX100's sensor, though used in different way is bog standard so it benefits from economy of scale unlike what you're proposing here.I see a great Cost/Benefit ratio here. Versatility and higher Quality, its a more efficient way to get what lenses can produce.
Panasonic did bother to do it with their GH5S as well as my LX100. From personal experience I can tell you that the benefits are worth it.
Neither of those supports your argument that it could be done cost effectively. Quite the opposite, I'd say.
It is a safe assumption that the market for that camera was a fraction the size of a mid to high end Sony ILC would be.
Another real world example, the Sigma Quattro H uses an exclusive Sigma Foveon APS-H sensor and that camera is currently selling for $1,200
I'm pretty sure production cost wouldn't be an issue.
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