You do understand the subject of this thread is about 8K Rawlight for the R5 and so for video purpose only, right?
Way back, I used to shoot Tv commercials. Yeah, back in the days of film. We used 16mm Arris, and 35mm Mitchels (heavy beast).
rarely, a commercial was 5 minutes long, for special presentations. Usually we shot for a two minute insert. But that could be over a dozen individual shots. Most being no more than 20 seconds. Then, often, because of retakes, with a minute or two between, a bunch of those. Film wasn’t long enough to shoot 30 minutes at a time, even if we would have wanted to. So we had lots of film changes during shoots.
today, with digital, the same situation exists. nothing new there. And yes, we had backup equipment. It’s very expensive to get a shoot together, particularly if on location. Having extra equipment is cheap in comparison. I can’t imagine not having at least two digital cameras on hand at all times, very possibly three, considering how cheap even an expensive video camera, at $15,000, is when compared to the price of what we used back them.
as for the R5, it’s practically a throw away body.