The technical aspects of the Robinson R-22 rotor have been much discussed on this forum. To the disgust of some, while to the entertaining, or education of others.
There are very few ways of evaluating the safety of the Robinson. One is to statistically determine if the craft has a poorer or better safety record then comparable helicopters. Another is to re-evaluate the craft and its rotor, using today's level of engineering capability. It is doubtful whether either means could arrive at a definitive answer.
I strongly believe in the future advantages of (very) high rotor rigidity. Therefor, there is a personal dislike of 'loosey-goosey' rotors and blades.
The trend has been toward greater rotor rigidity. This is born out, in part, by the evolution from teetering rotors, to articulated rotors, to hingeless rotors. Robinson has taken the opposite approach. It has increased flexibility, by taking a teetering rotor and incorporating coning hinges.
It is questionable whether the advantages of these coning hinges outweigh their disadvantages.