Crab, Bell haven't moved from their 206 head design either.
True. That design is why another one died recently on IOM, apparently from turbulence induced mast bumping. And that design will contiue to kill people in the 505.
They may be a lot to be said in favour of twin bladed tethering Bells, from space savings in the hangar, over cool blade sound till great Bell customer service. But tethering rotor heads are stupid, dangerous, early ages designs. It should not be possible to get a new aircraft design certified using them.