Evidently, you forget the original Ruger Vaqueros which have a low profile hammer (you can see the sights without cocking the hammer) and the OMV is still legal, isn't it? WBR
But the Ruger is "grandfathered" into the rules because back in the day there was a lack of more authentic revolvers, Rugers were easy to get, and so many shooters had them already. This is a
new revolver and must be accepted or rejected according to the rules for new ones. On the other hand, to me the hammer looks like most other SAA hammers and appears to block the shooter's view of the sights when it's down. I see no problem with it.