The cameras that do that at the moment are the R3, A1, A9, and Z9. However, did Sony add the tunable shutter speeds to the A9 (I don't recall)? When you get in some lighting situations or have certain displays in the background, you need to be able to tune the shutter speed to the frequency being used by the lighting or display. The R3, A1, and Z9 have that.
I'd say that it's more likely that the Sonys are being used more ubiquitously because they were the first cameras that allowed the still photographer to roam on set without a blimp. Canon and Nikon didn't get there until far later.