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https://www.metabones.com/article/of/Introduces_Canon_EF_to_EOS_R_SpeedBooster 4k crop is down to 1.24x with an extra stop of light, control ring function retained as well. This looks more like an improved 1DC now (including the rolling shutter and effectively loosing 60p, since it only works...

Not sure how much they can improve it with firmware, but it sounds like there is one more case for their "old" DSLR cameras. Due to the current climate, it may not occur at all in most locations. I wonder how the Nikon mirrorless cameras fare in similar circumstances.