Helicopter flying, like most types of flying but overtly so, is a risk management trade off process (like flying within the HV curve to a confined area landing whilst attempting to limit the chance of vortex ring state occurring). The chance of blade failure when cresting the red line is very small and the benefits of extra energy in the touch down on what will likely not be a great auto surface. In a 44 this might not be necessary but in a 22 I would definitely bank the additional RRPM as this will translate to survivability.
If you were to read on a variety of sites like pprune or just chatting to some heli instructors you would see that rotor overspeeds do happen and whilst some cause no damage others require maintenance, however you do not hear about minor incursions over the red line equating to blade failure and therefore the better of the two risks to accept.
Extra RRPM is likely to provide better cushioning from spinal injuries as it provides addition energy at one of the critical points of the auto to reduce vertical impact forces. In training we have all pulled off really nice top of the green autos to the deck but in a real world engine failure with the associated stressors your performance is not likely to be as finessed as with an instructor beside you over a nice pad or piece of runway on a lovely day into wind to full down auto into. I believe that most pilots in a real life auto will write off the heli so practically speaking for the lower hours types like myself it is about reducing impact forces and thus increasing survivability.
In short serious spinal injuries with the opportunity to burn at the crash site in a 22 or a blade overspeed under 110% which would not result in blade failure.
Out of interest do you/did you fly helis Chocolate?