I think that about sums it up. I've never before heard of anyone seriously using pixel shift. The consensus seems to be that it's more of gimmick that rarely delivers anything close to what you'd expect.
The camera should take pictures with the IBIS fractional picture shift and save the RAW files. They should give the option of how many "cycles" (go through all the shift orientations more than once) of pictures to take. With that level of information, smart software will be able to figure out and deal with at least small hand motions and considerable motion in the subject.
Smartphones are already using computational photography, combining multiple photos for things like panning and taking pictures in the dark. For a dedicated camera like the R5 mk ii, I would want the camera to save RAW images that can be put together later by "smart" software on a computer with greater processing and memory resources.