As someone who knows nothing about cameras, that was a fascinating read.
Its only a few cinemas that are capable of 4k (thats 4098x 2160) and even fewer films released in 4k.
Since they were switching to new hardware anyway, why didn't they just make the CCD the shape they actually wanted, rather than relying on this weird archaic workaround?
Same idea as recording individual audio tracks at extremely high quality. The final mix ends up sounding better than you might expect.