It used to be that it was a lot cheaper to buy large sensor dslr/mirrorless than a dedicated video camera. You could pair it with a decent lens, and get a competent kit that far surpassed the quality of equally priced camcorder. Then there was size factor. For American Sniper they used the old 1080p bmpc for some cramped chopper shots, there was nothing else as small on the market. Today, the price and size differences have been reduced considerably, you have Komodo 6k and Alexa Mini LF, that are barely any larger than mirrorless cameras, and R5 and A1 that are nearly as costly as Komodo, yet youtoubers and marketing departments will still highly hype hybrids as sole option on the market. So a lot of people don't even know of Z-Cam's, Lumix BGH1, C200, Ursa Mini, or Sigma's FP.Concerning 8K vs 4K video, if a person is that into video that they need or want that higher quality video, wouldn't they want an actual video camera anyway? It has always kind of mystified me that still-image form-factor cameras have to be video cameras too. OK, the market demands it, but even for high-high end video? Can't we draw the line and say "you want that, buy a real video camera"?