Exposure bracketing is only feasible for completely static scenes. You don't need to use it, but I'll gladly take multiple stops extra DR for all shots. Seems useful for all kinds of scenarios for me.
The fundamental difference regarding the DGO technology is that with a stills camera you are not keeping a constant base ISO of 800.
Sometimes you need to go lower and sometimes higher.
And lowest native ISO if 100 with a mechanical shutter will perform better anyway compared to using the electronic shutter (without DGO), so the benefit regarding dynamic range is reduced.
So it is a lot more complicated on a stills camera, and there is less to gain: there is a fair amount of circuitry that they need to add just for that one scenario (it might add more noise at high ISOs) and it consumes a lot of extra power, too.
And of course all these 8K DGO sensor cameras will cost well over 10000$.
The C70 is the cheapest one with DGO, it is only 4K and S35mm size, so I doubt that it is that much better over the R5 in stills mode with mechanical shutter at ISO 100 (for video, even against RAW it has a clear advantage).
It it more likely that with the newest cameras with stacked sensors, there will be an HDR stills mode merging multiple images like on smartphones.