Here are the Full Canon EOS R6 V Specifications

[neuroanatomist]

Sony does allow flash sync with its ZV-E10 II, that does not have shutter curtains, however that camera can only sync at up to 1/30th.

If the R6 V has the same readout speed as the R6III (13-13.5 ms), that would support X-sync of around 1/60 s - 1/80 s. I guess Canon decided that was too slow.

 

[m4ndr4ke]

If the R6 V has the same readout speed as the R6III (13-13.5 ms), that would support X-sync of around 1/60 s - 1/80 s. I guess Canon decided that was too slow.

They want to keep selling the R6 Mark III to photographers, that's the thing.

EDIT: I honestly hadn't thought this deeply about these features, but if this camera had both a mechanical shutter and x-sync, it wouldn't be just "live view photographers" that would no longer but the R6 III, but studio photographers too.